Find the surface area of the composite figure.
2 cm
7 cm
2 cm
12 cm
12 cm
7 cm
7 cm
SA = [?] cm2

Answers

Answer 1

Answer:

You are to write a five paragraph literary essay based on one of the 4 prompts and what you have read and learned in this module. These are your options:

1. How do the events of "The White Umbrella" teach the narrator a lesson about shame and acceptance?

2. What role does creativity play in "The Bat-Poet"?

3. How does the character of Squeaky change over the course of "Raymond's Run"?

4. Discuss the influences of older family members on the protagonists and speakers in the stories and poems of this unit.

You are to write a five paragraph literary essay based on what you have read and learned in this module. Your final submission should meet the following requirements.

• Submit completed pre-writing and outline documents.

• Write an essay that contains an introduction with hook and thesis statement, supporting paragraphs with evidence and at least one quotation, and a conclusion that restates the thesis and reviews main points.

• Use transitions appropriate to the pattern of organization.

• Use vocabulary to create tone and voice.

• Cite primary source (quotation).

• Submit completed revision checklist.

• Vary sentence structure.

• Create sentences with parallel structures.

• Use technology in the writing process.

Step-by-step explanation:


Related Questions

Solve for all values of y in simplest form.
21 = |7y|
Answer: y =
Submit Answer

Answers

Answer: y= ±3

Explanation: 21/7=3 BUT the absolute sign mean no matter whats inside the sign the outcome will always be positive afterwards , so it can be a positive or negative 3.

The point-slope form of the equation of the line equation of the line that passes through (-9,-2) and (1,3) is y-3=1/2(x-1)

Answers

Answer:slope is 1/2, intercept is 2.5

Step-by-step explanation:slope is coefficient of x. Intercept is sun of constants on right side when left side is y. Add 3 to both sides

Look at the corners of the shape below. Which of the following points is located at one of the corners?

Answers

Answer: Coordinate (1,6)

Step-by-step explanation: Because it is located on one of the corners already if you count the spaces! I hope this helped!! :D

Answer:

the person above me is right its (1,6) its the only one thats located on a corner

Step-by-step explanation:

Suppose you invest $1850 at an annual interest rate of 5.2% compound annually. write a function to re[resent the total earnings e(t) as a function of time in years,t.

Answers

Answer:$1,942.50

Step-by-step explanation:

A = P(1 + rt)

Calculation:

First, converting R percent to r a decimal

r = R/100 = 2.5%/100 = 0.025 per year.

Solving our equation:

A = 1850(1 + (0.025 × 2)) = 1942.5

A = $1,942.50

The total amount accrued, principal plus interest, from simple interest on a principal of $1,850.00 at a rate of 2.5% per year for 2 years is $1,942.50.

prove that n^2 +(n+1)^2 is always an odd number

Answers

I assume [tex]n\in\mathbb{Z}[/tex] (or at least [tex]n\in\mathbb{N}[/tex]).

[tex]n^2+(n+1)^2=n^2+n^2+2n+1=2n^2+2n+1=2(n^2+n)+1[/tex]

The above is always odd, because one of the factors of [tex]2(n^2+n)[/tex] is even, which makes the product even as well, and 1 is odd, and the sum of an even number and an odd number is an odd number.

what is 10 1/2 divide by 2 1/4

Answers

Answer: 4 2/3 or 14/3 if wanting a improper fraction.

f(x) = 3 and g(x) = x – 2

3 = x – 2

5 = x

Answers

Answer:

The question is incomplete

Step-by-step explanation:

Because the question not tells that what is to be find .

Help
if g(x)=x+1 and h(x)=4-x, what is the value of (gh)(-3)
---------
x-2

Answers

Answer: 8/5

Step-by-step explanation:

[tex](g \circ h)(-3)[/tex] is the same as g(h(-3)).

[tex]h(-3)=4-(-3)=7\\g(h(-3))=g(7)=\frac{7+1}{7-2}=\boxed{\frac{8}{5}}[/tex]

2. Identify the missing factors:


d) 20 = (4) (?)


e) -14x = (7) (?)


f) x3 =x2 (?)

Answers

Answer:

d) 20 = (4) (5)

e)-14x = (7) (0) = undefined

f) Every Real numbers are solutions, here.

Step-by-step explanation:

2) Identify the missing factors:-

d) 20 = 4(?)

Solved:

Let us assume that *?* = x here.

20 = 4x20/4 = x5 = xx =5

e)-14x = (7) (?)

Assume *?* as x

-14x = 7x−14x−7x=7x−7x−21x=0x = 0/-21 = undefined

f) x^3=x^2(?)

Assume ? as x

x³=x²(x)x³−x³=x^3−x^30=0Real numbers are solutions.

11.3 9 9 9 7.8 surface area of triangular prism

Answers

Answer:

Total area = 187.65 cm^2

Step-by-step explanation:

AREA of a triangle = 1/2 base * height

THREE sides    3     * 1/2 *9 *  11.3  = 152.55 cm^2

Bottom                       1/2 * 9 * 7.8  = 35.1 cm^2

  total = 187.65  cm^2

A spherical balloon is inflated with gas at the rate of 500 cubic centimeters per minute. How fast is the radius of the balloon increasing at the instant the radius is 70 centimeters

Answers

Using implicit differentiation, it is found that the radius is increasing at a rate of 0.0081 cm per minute.

What is the volume of a sphere?

The volume of a sphere of radius r is given by:

[tex]V = \frac{4\pi r^3}{3}[/tex]

Applying implicit differentiation, the rate of change is given by:

[tex]\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt}[/tex]

In this problem, we have that:

[tex]\frac{dV}{dt} = 500, r = 70[/tex]

Hence the rate of change of the radius is given as follows:

[tex]\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt}[/tex]

[tex]19600\pi\frac{dr}{dt} = 500[/tex]

[tex]\frac{dr}{dt} = \frac{500}{19600\pi}[/tex]

[tex]\frac{dr}{dt} = 0.0081[/tex]

The radius is increasing at a rate of 0.0081 cm per minute.

More can be learned about implicit differentiation at https://brainly.com/question/25608353

#SPJ1

ANYONE?? PLEASE HELP??!

Answers

Answer:

the answer is B:42.8

Step-by-step explanation:

because when u do this :24+58+30+42+87+11+ 12+55+91+18 = 428

the total numbers here is 10. so 428÷10 = 42.8

That is how u get ur final answer

u hope have helped you dear

oam. The pit
p is the pit?
The gymnastics center where Alexander
works has a rectangular pit filled with
foam. The pit has a volume of 70
m³, and it has a length of 7 m and a width
of 5 m. How deep is the pit?
35 m
2m
14 m
10 m

Answers

Answer:

2 m.

Step-by-step explanation:

Volume = length * width * depth

70 = 7 * 5 * d     where d = depth

d = 70 / (7*5)

   =  70/35

    = 2 m.

the sum of two consecutive integers is 65. what are the two integers? show steps please.

Answers

Hi student, let me help you out! :)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

We are asked to find the two integers, given that they are consecutive, and their sum is 65.

[tex]\triangle~\fbox{\bf{KEY:}}[/tex]

Consecutive integers are right next to each other, like 12 and 13. or 65 and 66.

Let the first integer be x, and let the second integer be x+1.

Their sum is 65. Let's set up our equation:

[tex]\longmapsto\sf{x+x+1=65}[/tex]

Combine like terms:

[tex]\longmapsto\sf{2x+1=65}[/tex]

Subtract 1 from both sides of the equal sign:

[tex]\longmapsto\sf{2x=64}[/tex]

Divide both sides by 2:

[tex]\longmapsto\sf{x=32}[/tex]

To find the second integer, subtract the first integer from the sum of the two integers:

[tex]\longmapsto\pmb{65-32}[/tex]

[tex]\longmapsto\pmb{33}[/tex]

The integers are: 33 and 32.

Hope it helps you out! :D

Ask in comments if any queries arise.

#StudyWithBrainly

~Just a smiley person helping fellow students :)

please help with this math problem i will give brainliest
Write the rational number as a decimal.
−38 =

Answers

Answer:

-0.38

Step-by-step explanation:

please help! please do not copy and paste i have seen the other ones

Given the function f(x) = 2(3)x, Section A is from x = 0 to x = 1 and Section B is from x = 2 to x = 3.

Part A: Find the average rate of change of each section.

Part B: How many times greater is the average rate of change of Section B than Section A? Explain why one rate of change is greater than the other.

Answers

Answer:

Given function:

[tex]f(x)=2(3)^x[/tex]

Part A

The average rate of change of function f(x) over the interval a ≤ x ≤ b is given by:

[tex]\dfrac{f(b)-f(a)}{b-a}[/tex]

[tex]\begin{aligned}\textsf{Average rate of change - Section A} & =\dfrac{f(1)-f(0)}{1-0}\\\\& =\dfrac{2(3)^1-2(3)^0}{1-0}\\\\& =\dfrac{6-2}{1}\\\\& =4 \end{aligned}[/tex]

[tex]\begin{aligned}\textsf{Average rate of change - Section B} & =\dfrac{f(3)-f(2)}{3-2}\\\\& =\dfrac{2(3)^3-2(3)^2}{3-2}\\\\& =\dfrac{54-18}{1}\\\\& =36 \end{aligned}[/tex]

Part B

[tex]\dfrac{\textsf{Average rate of change of Section B}}{\textsf{Average rate of change of Section A}}=\dfrac{36}{4}=9[/tex]

Therefore, the average rate of change of Section B is 9 times greater than Section A.

The function is an exponential function (with 3 as the growth factor) so the rate of change increases over time.

Hi, I'm in 7th grade and I'm about to fail Mathematics. Please help me...
2x - 5x =

Answers

i beliebe 3×=0

ao the answer should be x/0

Answer:

-3x

Step-by-step explanation:

The order of where the terms are placed definitely matter for subtraction. 5x-2x is 3x, but because the smaller number is first, we've gone into the negatives. Think of it like this:

2x - 5x

-2x   -2x

__    __

0      -3x

Because we still have the - in front of the 3, it is a negative 3.

Hope this helps!

For each of the examples below, identify
the bearing of D from C.
a)
b)
N
220°
140°
155°
D
C
205°
Not drawn accurately

Answers

Answer:

140°

205°

Step-by-step explanation:

For A

The bearing of D from C is the angle at the line joining D and C while coming from the north pole in a clockwise direction.

from the diagram, the answer is = 140°

For B

The bearing of D from C is obtained same as A

so the answer is = 205°

Determine the value of Y.

Answers

Answer:

y=10°

Step-by-step explanation:

Here,

→(3x+18)°=(5x-4)°

→18°+4°=5x-3x

→22°=2x

→x=11°

Also,

3(4y+3)°+5x-4°=180°[The sum of the linear pair is 180°]

12y+9°+5x-4°=180°

12y+5°+5×11°=180°

12y+5°+55°=180°

12y=180°-60°

12y=120°

y=120°/12

y=10°

Opposite angles are equal

3x+18=5x-422=2xx=11

Now

linear pairs are supplementary

3x+18+3(4y+3)=1803(11)+18+12y+9=18033+18+12y+9=18012y+60=18012y=120y=10

What is the percentage of 0,4(That is a decimal fraction)​

Answers

Answer:

0.4= 4/10= 2/5

Step-by-step explanation:

The first decimal place after the point represent the place holder "tenth's"

0.4 = 4/10

This can simply to 2/5

Hope it will help:-)

2 over 5

Step-by-step explanation:

0.4=4 over 10 simplify=2over5

The area of a rectangle is 44 square units. Its length measures 4 units. Find the length of its diagonal. Round to the nearest tenth of a unit.

Answers

Answer:

√(137)

Step-by-step explanation:

First, you will need to find the other side length.....then you can use the Pythagorean Theorem to find the diagonal:

L x W = 44

4 x W = 44

W =11

Now the Pythag, Theorem:

 diagonal^2 = 4^2 + 11^2

        d^2 = 16+121

         d^2 = 137

          d = √(137)

Answer:

about 11.7 units (Pls mark me as brainy)

Step-by-step explanation:

Find the width:

length⋅width=  area

4w=44    Plug in known values.

4w/4=44/4    Divide both sides by 4

w=11

Find the diagonal:

(4)^2+(11)^2=  c^2   Use the Pythagorean Theorem.

16+121=  c^2   Simplify.

137=c^2   Simplify.

±√137​= √c^2   Square root both sides.

11.704699...= c   Simplify. Ignore the negative root, as the length must be positive.

11.7≈ c     Round to the nearest tenth.

The length of the diagonal is 11.7 units.

In the 3rd quarter of year 5, what
were the approximate total sales in
the coastal region?

Answers

In the 3rd quarter of year 5, the approximate total sales in the coastal region is; $7 million

How to find total sales?

The image of the graph showing the quarterly sales has been attached. From the graph, the red lines indicates the coastal region, the blue lines indicates the northern region, and the green lines indicates the southern region.

From the graph, in the third quarter, we can trace the total sales on the y-axis to be approximately $7 million dollars.

Read more about Total sales at; https://brainly.com/question/25623677

#SPJ1


What is the sum of √-2 and √-18?
O 4√2
O 4√21
O 5√2
O 5√21

Answers

Answer:

[tex]4 \sqrt{2} \: i[/tex]

Step-by-step explanation:

[tex] \sqrt{ - 2} + \sqrt{ - 18} \\ ( \sqrt{2} \times \sqrt{ - 1} ) + ( \sqrt{18} \times \sqrt{ - 1} ) \\ ( \sqrt{2} \times \sqrt{ - 1} ) + (3 \sqrt{2} \times \sqrt{ - 1} ) \\ \sqrt{2} i + 3 \sqrt{2} i \\ = 4 \sqrt{2} i[/tex]

The sum of √-2 and √-18 is 4i√2.

What are Irrational Number?

Any real number that cannot be written as the quotient of two integers, p/q, where p and q are both integers, is referred to as an irrational number.

We have √-2 and √-18.

To find the sum of √-2 and √-18 we need to perform addition as

= √-2 + √-18

= √2i + √18i

= √2i  + 3i√2

= 4i√2

Learn more about Irrational Number here:

https://brainly.com/question/17450097

#SPJ5

help me plss ty in advance:))​

Answers

Answer:

AACBC7

Step-by-step explanation:

Q1

A graph which uses horizontal or vertical bars with no gaps to represent data is called bar graph.

Q2

Data plotted against the frequency in a histogram is class interval.

Q3

The data plotted against the frequency in an ogive is cumulative frequency.

Q4

A score of 50 under the column > c.f. with the boundaries 23.5 - 28.5 means 50 students got a score greater than 23.5.

Q5

Mean = 2(2) + 3 + 4 + 7(3) + 10 + 11 + 2(12) / 11

Mean = 4 + 7 + 21 + 21 + 24 / 11

Mean = 77/11

The mean is 7

Q6

The median is the middle term.

The median of the distribution is 7

BRAINLIEST if correct answer

Answers

total price of made dolls:

n×£8.50

=170×£8.50

=£1445

total cost:

C= 5n+432

C = 5×170+432

C= £1282

profit=price-cost

p= £1445-£1282

= £165

It takes 15 people to play a 13 minute pool game. How many people would it take to play a 39 minute game?

Answers

Answer:

depends on how much beer is left

Step-by-step explanation:

45 people would it take to play a 39 minute game.

What is Ratio?

Ratio is defined as a relationship between two quantities, it is expressed one divided by the other.

What is percentage?

The percentage is defined as the ratio expressed as a fraction of 100.The percentage is denoted by sign of %.For example, if XYZ scored 46% marks in his test, it means that he scored 46 marks out of 100. It is written as 46/100 in the fraction form and 46:100 in terms of ratio.

Given that,

It takes 15 people to play a 13 minute pool game

So, a 23 minute pool game played by 15 people

A one minute pool game played by 15/13 people

The ratio of one minute pool game to people = 15 : 13

A 39 minute pool game played by number of people = 39(15/13)

A 39 minute pool game played by number of people = 45

Hence, 45 people would it take to play a 39 minute game.

Learn more about Ratio here:

brainly.com/question/1504221

#SPJ2

Solve the equation
3(2x + 2) = 3x - 15

A. X = -7
B. X = -17/3
C. X = 3
D. X = 7

Answers

When starting a problem, almost every single problem needs to be understood by the person answering so they can see what needs to be done.  In this example, we are given an expression and told to solve the equation which means that we need to solve for the unknown, in this case x.

Now that we know what we must do, we can start to solve the problem. Looking at the problem we can see that the step that we must take is to distribute 3 into the parenthesis.

Distribute

[tex]3(2x + 2) = 3x - 15[/tex][tex](3*2x) +(3* 2) = 3x - 15[/tex][tex](6x) +(6) = 3x - 15[/tex][tex]6x+6 = 3x - 15[/tex]

Now that we distributed the values inside of the parenthesis we can move onto the next step which is to help isolate x.  What we should do is subtract 6 from both sides which will help leave x with its coefficient alone.

Subtract 6 from both sides

[tex]6x+(6 - 6 )= 3x +(- 15 - 6)[/tex][tex]6x= 3x +(- 15 - 6)[/tex][tex]6x= 3x - 21[/tex]

The next step that we should take to help solve for the unknown is to subtract 3x from both sides.

Subtract 3x from both sides

[tex](6x - 3x)= (3x - 3x) - 21[/tex][tex](6x - 3x)= - 21[/tex][tex]3x = - 21[/tex]

The final step that we must take to help isolate the unknown would be to divide both sides by 3.  This would remove the coefficient from x and we would get -21 divided by 3.

Divide both sides by 3

[tex]\frac{3x}{3} = \frac{- 21}{3}[/tex][tex]x = \frac{- 21}{3}[/tex][tex]x = -7[/tex]

Therefore, after simplifying the expression that was given to solve for the unknown we were able to determine that the option that would best match the solution is option A, x = -7.

Answer:

a) x = -7

Step-by-step explanation:

Given: 3(2x + 2) = 3x - 15

1. Distribute:

3(2x) + 3(2) = 3x - 15

⟹ 6x + 6 = 3x - 15

2. Subtract 3x from both sides:

6x - 3x + 6 = 3x - 3x - 15

⟹ 3x + 6 = -15

3. Subtract 6 from both sides:

3x + 6 - 6 = -15 - 6

⟹ 3x = -21

4. Divide both sides by 3:

3x ÷ 3 = -21 ÷ 3

x = -7

5. Check your work:

3(2x + 2) = 3x - 15

3(2(-7) + 2) = 3(-7) - 15

3(-14 + 2) = -21 - 15

3(-12) = -21 - 15

⟹ -36 = -36 ✔

Learn more here:

brainly.com/question/27863785

brainly.com/question/27543580

What should be done so that the expression will have a value of 10?

12 - 2 + 2 2 ÷ 8

Answers

answer: 10
use (PEMDAS)
P parentheses ()
E exponents
M multiplication • , () , x
D division
A addition +
S subtraction -
Explanation:
There are no parentheses.
There are exponents.
The multiplication is the exponents.
There is division.
There is addition and subtraction.
-how to solve-
First, do 2 to the second power and get 4.
Next, do 12-2+4 divided by 8.
Next do multiplication: there’s no more.
Next do division: you can’t do 4 divided by 8 so instead, do 12-2 = 10 plus 8.
Hope this helps!

What is the closest point on the line y = 2x - 5 to (4, 8)?

Answers

Answer: I think it is (6.5, 8).

Step-by-step explanation:

I don't know if you had any choices, but I graphed it on Desmos and that was the closest point. I hope this helps!! :)

Convert 650 ml into litres

Answers

Answer:

.65 litres

Step-by-step explanation:

Other Questions
what two ideas from the Scientific Revolution do you think were most important in influencing the Age of Exploration and why? What effects did they have on explorers and on nations? Sociologists would use this term to desribe the experiences of gemma- the lady from scotland- who was asked to remove all of her clothing for a massage in budapest or sarah carter's experience of "chaotic synchronicity" as a european in vietnam as: a. ideal culture b. culture shock c. cultural leveling d. anomie Why do test makers refer to the first term in a sequence as a sub zero sometimes as opposed to a sub 1? Choose the correct form of the pronoun in parentheses: (Who, Whom) is on the telephone? Aquatic nitrate pollution can result in _____. algal bloom oxygen depletion fish kills hypoxia an algal bloom that, when the algae die and are decomposed by bacteria, leads to hypoxia and the death of fish Zone, n = (sum of digits of your student id)% 8 for example, if your student id is 17301283, zone = (1+7+3+0+1+2+8+3) % 8 = 25 % 8 = 1 derive midpoint line drawing algorithm for a line in zone n. if you find zone 0, i.e., then drop the last digit from sum and take % 8 again. if your student id is 16240524, zone = (1+6+2+4+0+5+2+4)%8 = 24%8 = 0 updated zone by removing last digit 4 = (1+6+2+4+0+5+2)%8 =20%8 = 4 derive midpoint circle drawing algorithm for the arc of the circle in zone n. if you find zone 1, i.e., then drop the last digit from sum and take % 8 again. if your student id is 17301283, zone = (1+7+3+0+1+2+8+3)%8 = 25%8= 1 updated zone by removing last digit 3 = (1+7+3+0+1+2+8)%8 = 22%8= 6 A good long distance runner has an average speed of 5.5m/a. How far would the runner go in 30 mins Industrialization led to increased demands by the public for _______________.Answer on Edge is "A MORE DEMOCRATIC GOVERNMENT"*Couldn't figure out how to just post the question with the answer* During endochondral bone formation, the secondary ossification center never begins to form. What will the developing bone look like Which statement is true about angles 3 and 6? A. They Are adjacent angelesB. They Are complementary anglesC. They are supplementary anglesD. They are vertical angles How did the Constitution address the problem under the Articles of Confederation that Congress had no power to ensure were followed by the Which adaptation favors the survival of an organism?a ground squirrel population in the forest develops webbed feet for swimminglengths of beaks in a bird population increase to the point birds can no longer groom themselvesa desert coyote population loses the ability to cope with low water conditionsproteins expressing color in butterfly wings mutate to improve camouflaging abilities of butterfliesI'm pretty sure it's "proteins expressing color in butterfly wings mutate to improve camouflaging abilities of butterflies" but I'm not sure What will be the output, if any, when the user clicks the right mouse button?from tkinter importdef clicked(event): print("That hurt.")widget = Button(None, text='Button')widget.pack()widget.bind('', clicked)widget.mainloop()O an error statementO That hurt.O no outputO Button why people may feel a greater sense of connectedness during the Holy Month of Ramadan. The destination transmission control protocol (TCP) process has set a 1,000-byte receive buffer window. The source TCP sequence number starts at 23,100 and sends the following segments, in order: Segment 1-200 bytes; Segment 2-300 bytes; Segment 3-200 bytes; and Segment 4-300 bytes. The last acknowledgment the source received was sequence number 23,600 saying the receive buffer can now hold 800-300 byte streams. The retransmission timer for sequence number 23,600 has expired, so what will the source TCP do next 17sked out ofBotanic Choice signs an agreement on January 1, 2019, to lease equipment to Famous Furniture. Thefollowing information relates to this agreement.. The term of the non-cancelable lease is 4 years with no renewal option. The equipment has an estimatedeconomic life of 6 years. The fair value of the equipment on January 1, 2019, is 40,000. The asset will revert to the lessor at the end of the lease the term, at which time the asset is expected tohave a residual value of 6,000, none of which is guaranteed. The agreement requires equal annual rental payments of 9,538.39 to the lessor, beginning onDecember 31, 2019. The lessee's implicit rate is 8 %. Present value of an ordinary annuity of $1 for number of periods = 4,interest 8% equals 3.31213.What is the balance of lease liability (noncurrent) on December 31, 2019?Select one:a. 31.592.39b. 17,009.5124.581.39d. 22053.99 please help meeeee I really need it What accusation was given by President Bush as a reason for invading Iraq but later proved false?A. The United States would be joined by France and Saudi Arabia, so victory would be quick.B. Saddam Hussein had weapons of mass destruction.C. Iraq had oil that belonged to the United States and Saddam Hussein was refusing to release it.D. Osama bin Laden was hiding in Iraq. On Monday the temperature was -7 degrees Fahrenheit in Akron Ohio on Tuesday the temperature was colder than Monday what is a possible temperature in degrees Fahrenheit for Tuesday Def transfer(bank, log_in, usera, userb, amount): ''' in this function, you will try to make a transfer between two user accounts. bank is a dictionary where the key is the username and the value is the user's account balance. log_in is a dictionary where the key is the username and the value is the user's log-in status. amount is the amount to be transferred between user accounts (usera and userb). amount is always positive. what you will do: - deduct the given amount from usera and add it to userb, which makes a transfer. - you should consider some following cases: - usera must be in the bank and his/her log-in status in log_in must be true. - userb must be in log_in, regardless of log-in status. userb can be absent in the bank. - no user can have a negative amount in their account. he/she must have a positive or zero balance. return true if a transfer is made. for example: