A brick has dimensions of110. cm x 655 cm x 1330 cm.What is the volume of the brick incubic meters?[?] m3Recall that 1 cm =10-2 mGive your rounded answer to the correct number ofsignificant figures.Volume, cubic metersEnter
![A Brick Has Dimensions Of110. Cm X 655 Cm X 1330 Cm.What Is The Volume Of The Brick Incubic Meters?[?]](https://brainimage.s3.us-east-005.backblazeb2.com/contents/attachments/taKMpvb1kgLqTiOyyrz91BftMQcBVBWK.jpeg)
Answers
The dimension of the brick is given 110 cm x 655 cm x 1330 cm.
We know that 1 cm = 10^-2 m.
So, the dimensions of brick in meters will be 1.10 m x 6.55 m x 13.30 m.
The volume of the brick is calculated below:
[tex]\begin{gathered} V=1.10\times6.55\times13.30 \\ =95.8265m^3 \end{gathered}[/tex]Thus, the volume of the brick in cubic meters is 95.8265 m^3.
Related Questions
√X²+5x+4/X²+8x+16 - X²-3x-4/X²-16
Answers
The expression given as [x²+ 5x + 4]/[x² + 8x + 16] - [x² - 3x - 4]/[x²-16] simplifies to 0
What are expressions?Expressions are mathematical statements that are represented by variables, coefficients and operators
How to evaluate the expression?The expression is given as
[x²+ 5x + 4]/[x² + 8x + 16] - [x² - 3x - 4]/[x²-16]
Factorize the expression
So, we have
[x²+ 5x + 4]/[x² + 8x + 16] - [x² - 3x - 4]/[x²-16] = [(x + 4)(x + 1)]/[(x + 4)(x + 4)] - [(x - 4)(x + 1)]/[(x + 4)(x - 4)]
Simplify the common factors
So, we have
[x²+ 5x + 4]/[x² + 8x + 16] - [x² - 3x - 4]/[x²-16] = [(x + 1)]/[(x + 4)] - [(x + 1)]/[(x + 4)]
The terms of the above equation are the same
So, the result of subtracting one from the other is 0
This gives
[x²+ 5x + 4]/[x² + 8x + 16] - [x² - 3x - 4]/[x²-16] = 0
Hence, the value of the expression is 0
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What’s 2,0000000 +3000,00000
Answers
In order to add these two numbers, we need to add the algarisms that are in the same position.
Since the first number has 7 zeros and the second one has 8 zeros, the numbers 2 and 3 will not be added, since they are in different positions (the number 3 has more "value", since it's in a higher position).
So, adding these two numbers, we have:
Therefore the result of this sum is 320,000,000 (three hundred and twenty million).
will give brainlist
Solve the inequality n minus three fifths is less than or equal to negative four sevenths for n.
n is greater than or equal to negative forty one over thirty five
n is less than or equal to negative one over thirty five
n is less than or equal to one over thirty five
n is greater than or equal to forty one over thirty five
Answers
The solution to the given inequality would be n ≤ 1/35 which is the correct answer would be an option (C).
What is inequality?Inequality is defined as mathematical statements that have a minimum of two terms containing variables or numbers that are not equal.
We have to determine the solution of the inequality n minus three-fifths is less than or equal to negative four sevenths for n.
As per the given condition, translate the phrase into an algebraic inequality as :
⇒ n - 3/5 ≤ - (4/7)
⇒ n ≤ 3/5 - (4/7)
⇒ n ≤ (21 - 20)/35
⇒ n ≤ 1/35
Therefore, the solution to the given inequality would be n ≤ 1/35.
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According to the Oxnard College Student Success Committee report in the previous year, we believe that 22% of students struggle in their classes because they don't spend more than 8 hours studying independently outside of a 4-unit class. For this year, you would like to obtain a new sample to estimate the proportiton of all Oxnard students who struggle in their classes because they don't study enough outside of the classrooms. You would like to be 95% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? Do not round mid-calculation.n =
Answers
The required sample size, using the z-distribution, is given as follows:
n = 253.
What is a confidence interval of proportions?A confidence interval of proportions has the bounds given by the rule presented as follows:
[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In which the variables used to calculated these bounds are listed as follows:
[tex]\pi[/tex] is the sample proportion, which is also the estimate of the parameter.z is the critical value.n is the sample size.The equation for the margin of error is given by:
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
The confidence level is of 95%, hence the critical value z has a p-value of [tex]\frac{1+0.95}{2} = 0.975[/tex], so the critical value is z = 1.96.
The estimate and the margin of error are given as follows:
[tex]\pi = 0.22, M = 0.015[/tex]
Hence the required sample size is calculated as follows:
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
[tex]0.015 = 1.96\sqrt{\frac{0.015(0.985)}{n}}[/tex]
[tex]0.015\sqrt{n} = 1.96\sqrt{0.015(0.985)}[/tex]
[tex]\sqrt{n} = \frac{1.96\sqrt{0.015(0.985)}}{0.015}[/tex]
[tex](\sqrt{n})^2 = \left(\frac{1.96\sqrt{0.015(0.985)}}{0.015}\right)^2[/tex]
n = 253. (rounding up, as a sample size of 252 would result in a margin of error slightly above 1.5%).
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If E is the midpoint of DF
with DE = 9x + 24 and
EF = 18x - 39, then find x
and DF.
Answers
Answer:
x=7, DF = 174
Step-by-step explanation:
18x-39=9x+24
9x=63
x=7
:]
6. The equations of two lines are 6x - y = 2 and 4x - y = -8. What is thevalue of y in the solution for this system of equations?Your answer
Answers
The given system of equations : 6x - y = 2 and 4x - y = -8.
6x - y = 2 ( 1 )
4x - y = -8 ( 2 )
for the value of y, use substitution method:
Solve the equation (1) for y :
6x - y = 2
y = 6x - 2
Susbtitute the value of y in the equation ( 2 )
4x - y = - 8
4x - (6x - 2) = - 8
4x - 6x + 2 = - 8
4x -6x = - 8 - 2
-2x = -10
Divide both side by ( -2)
-2x/(-2) = -10/(-2)
x = 5
Substitute x = 5 in the equation ( 1 )
6x - y = 2
6( 5 ) - y = 2
30 - y = 2
y = 30 - 2
y = 28
So, the value of y is 28
Answer : y = 28
Find the equation of the line that passes through the given point and has the given slope. (Use x as your variable.)(4, −3), m = −2
Answers
General equation of line:
[tex]y=mx+c[/tex]Where,
[tex]\begin{gathered} m=\text{slope} \\ c=y-\text{intercept} \\ (x,y)=(4,-3) \end{gathered}[/tex]Slope of line is -2 then:
[tex]\begin{gathered} y=mx+c \\ y=-2x+c \end{gathered}[/tex][tex](x,y)=(4,-3)[/tex][tex]\begin{gathered} y=-2x+c \\ -3=-2(4)+c \\ -3=-8+c \\ 8-3=c \\ 5=c \end{gathered}[/tex][tex]\begin{gathered} y=mx+c \\ y=-2x+5 \end{gathered}[/tex]Equation of line is y=-2x+5
Given the function f(x)=x^2 and g(x)=(-x)^2-1 what transformations will occur if both functions are graphed on the same coordinate grid?
Answers
We are given the following two functions
[tex]\begin{gathered} f(x)=x^2 \\ g(x)=(-x)^2-1 \end{gathered}[/tex]Recall that the rule for reflection over the y-axis is given by
[tex]f(x)\rightarrow f(-x)[/tex]As you can see, the graph of g(x) will be a reflection over the y-axis of the graph f(x).
Recall that the rule for vertical translation (upward) is given by
[tex]f(x)\rightarrow f(x)-d[/tex]The above translation will shift the graph vertically upward by d units.
For the given case, d = 1
As you can see, the graph of g(x) will be a vertical translation of the graph f(x)
Therefore, we can conclude that the graph of g(x) will be a reflection over the y-axis and a vertical translation of the graph f(x).
1st option is the correct answer.
the midpoint between (42, 33) and (-2, -5)?
Answers
Answer: (40, 28)
Step-by-step explanation:
(42+(-2), 33+(-5))=
(42-2, 33-5)=(40, 28)
Please describe some of these new postulates and include a diagram on the whiteboard to help explain how they are applied.You have learned some new ways in this module to prove that triangles are similar Please describe some of these new postulates and include a diagram on the whiteboard to help explain how they are applied.
Answers
The Solution:
Required:
To use the three theorems of similarity:
There are 3 theorems for proving triangle similarity:
AA Theorem
SAS Theorem
SSS Theorem
SAS Theorem
What happens if we only have side measurements, and the angle measures for each triangle are unknown? If we can show that all three sides of one triangle are proportional to the three sides of another triangle, then it follows logically that the angle measurements must also be the same.
SSS Theorem
Or what if we can demonstrate that two pairs of sides of one triangle are proportional to two pairs of sides of another triangle, and their included angles are congruent?
AA Theorem
As we saw with the AA similarity postulate, it’s not necessary for us to check every single angle and side in order to tell if two triangles are similar. Thanks to the triangle sum theorem, all we have to show is that two angles of one triangle are congruent to two angles of another triangle to show similar triangles.
An arrow is launched upward with a velocity of 320 feet per second from the top of a 30-foot building. What is the maximum height
attained by the arrow?
Answers
Answer: Maximum height reached is 804.88 m
Step-by-step explanation:
At maximum height velocity is zero
We have equation of motion v² = u² + 2as
Initial velocity, u = 320 ft/s = 97.536 m/s
Final velocity, v = 0 m/s
Acceleration, a = -9.81 m/s²
Substituting
v² = u² + 2as
0² = 97.536² + 2 x -9.81 x s
s = 484.88 m
So the arrow further a height of 484.88 m
Total height = 320 + 484.88 = 804.88 m
AllusRotate the triangle 90° counterclockwisearound the origin and enter the newcoordinates.B'( 11 )Enter theC(1,1number thatbelongs in theA' ([?],[ ]green boxA(1,-1)B(4,-2)C(2,-4)Enter
Answers
For a 90 degrees counterclockwise rotation of a point, (x, y) about the origin, the new position would be (- y, x)
Thus,
For A', it becomes (- - 1, 1) = (1, 1)
For B', it becomes (- - 2, 4) = (2, 4)
For C', it becomes (- - 4, 2) = (4, 2)
The half life of radium -226 is 1640 years. If a sample contains 200 mg, how many mg will remain after 4000 years?
Answers
a = 1/2bh, solve for b
Answers
a = 1/2bh, solve for b
that means -----> isolate the variable b
so
[tex]\begin{gathered} a=\frac{1}{2}\cdot b\cdot h \\ \text{Multiply by 2 both sides} \\ 2a=b\cdot h \\ \text{Divide by h both sides} \\ b=\frac{2a}{h} \end{gathered}[/tex]therefore
the answer is
b=(2a)/hUse Heron's Area Formula to find the area of the triangle. (Round your answer to two decimal places.) A = 81°, b = 76, c = 39
Answers
First, let's find the measure of the third side, using the law of cosine:
[tex]\begin{gathered} a^2=b^2+c^2-2bc\cdot\cos(A)\\ \\ a^2=76^2+39^2-2\cdot76\cdot39\cdot\cos81°\\ \\ a^2=5776+1521-927.34\\ \\ a^2=6.369.66\\ \\ a=79.81 \end{gathered}[/tex]Now, let's use Heron's formula to calculate the area:
[tex]\begin{gathered} p=\frac{a+b+c}{2}=97.405\\ \\ A=\sqrt{p(p-a)(p-b)(p-c)}\\ \\ A=1463.75 \end{gathered}[/tex]Liam went into a movie theater and bought 9 bags of popcorn and 8 drinks,
costing a total of $97.50. Jacob went into the same movie theater and bought
5 bags of popcorn and 4 drinks, costing a total of $51.50. Determine the price
of each bag of popcorn and the price of each drink.
Each bag of popcorn costs $
and each drink costs $
Answers
Answer:5.50 & $6
Step-by-step explanation:
Each bag of popcorn is $5.50 and the drink is $6.
How to calculate the number of popcorn and drink?Liam went into a movie theater and bought 9 bags of popcorn and 8 drinks costing a total of $97.50. This will be:
9p + 8d = 97.50
Jacob went into the same movie theater and bought 5 bags of popcorn and 4 drinks, costing a total of $51.50. This will be:
5p + 4d = 51.50
where P = popcorn
d = drink
The equations will be:
9p + 8d = 97.50
5p + 4d = 51.50
Multiply equation i by 5
Multiply equation ii by 9
45p + 40d = 487.50
45p + 36d = 463.50
Subtract
4d = 24
Divide.
d = 24/4
d = 6
Drink = $6
Since 9p + 8d = 97.50
9p + 8(6) = 97.50
9p + 48 = 97.50
9p = 97.50 - 48
p = $5.50
Popcorn cost $5.50.
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Which equation best represents the graph above?
Answers
The equation is (x+1)²-4.
Here the graph is in the form parabola, where the parabola is basically a graph for a quadratic function which is a curve in such an order that a point on it is equidistant from a fixed point called the focus of the parabola, and a fixed line called the directrix of the parabola. The general formula for a parabola is: y = a(x-h)² + k , where (h,k) signifies the vertex whereas the standard equation of a parabola is y² = 4ax.
For the given graph the vertex is (h,k)=(-1,-4)
so the equation for the parabola is
=>y= a(x+1)^²-4 .......1
Since we can see the parabola intercept at the x-axis at point (1,0), putting those in the above equation :
=>0=a(1+1)^2-4
=>4=a(2)^2
=>a=1
So, substituting the value of an in equation 1, we get
=>y= (x+1)^2-4
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Consider the line with the equation: − 5 y − 5 x = 15 Give the equation of the line parallel to Line 1 which passes through ( 3 , − 10 ) : Give the equation of the line perpendicular to Line 1 which passes through ( 3 , − 10 ) :
Answers
The equations of the parallel and perpendicular lines are y = −x−7 and y = x−13, respectively.
The equation of the given line "Line 1" is :−5y−5x = 15Simplify the equation.y + x = −3Write the equation in the slope-intercept form.y = mx + cy = −x−3The slope of the line "Line 1" is −1.The parallel line will have the same slope and it passes through the point (3, −10).y = −x + c−10 = −3 + cc = −7The equation of the parallel line is y = −x−7.The slope of the perpendicular line will be the negative reciprocal of the slope of the given line.The slope of the perpendicular line is −1/(−1) = 1.y = x + cIt passes through (3, −10).−10 = 3 + cc = −13The equation of the perpendicular line is y = x−13.To learn more about lines, visit :
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Write the standard form equation of an ellipse with foci(-3,1)and(-3,13) and eccentricity e=0.6.
Answers
Given:
[tex]\begin{gathered} foci:-3,1),and,(-3,13) \\ And,eccentricity,e=0.6 \end{gathered}[/tex]To Determine: The standard form equation of an ellipse
Solution
I need help with this question but no one is helping me! Can someone please help me
Answers
Answer:
Step-by-step explanation:
Number of yellow marbles =13
Number of teal marbles = 13
Two marbles are drawn randomly
Probability that both marbles are teal
Hence the probability that both marbles are teal is 0.026
In a triple batch of a spice mix, there are 6 teaspoons of garlic powder and 15
teaspoons of salt. Answer the following questions about the mix.
2. How much salt is used with 8 teaspoons of garlic powder
3. If there are 14 teaspoons of spice mix, how much salt is in it.
4. How much More salt is there than garlic powder if 6 teaspoons of garlic powder are use
Answers
The answers of the given questions are:
8 teaspoons of garlic powder are combined with 20 tablespoons of salt.10 teaspoons of salt are included in every 14 teaspoons of spice mixture.If 6 teaspoons of garlic powder are used, there are 15 teaspoons more salt than garlic powder.What exactly are ratio and proportion?A ratio is an ordered pair of numbers a and b, denoted by the symbol a / b, where b does not equal zero. A proportion is an equation that sets two ratios equal to each other. For example, if there is one boy and three girls, the ratio could be written as: 1: 3 (for every one boy, there are three girls).Given: There are 6 teaspoons of garlic powder and 15 teaspoons of salt in a triple batch of spice mix.
Let x be the teaspoons of salt.
Salt used with 8 teaspoons of garlic powder:
6/15 = 8/x
x = 20
Therefore, 20 teaspoons of salt is used with 8 teaspoons of garlic powder.
6 + 15 = 21 teaspoons of spice mix
Salt used in 14 teaspoons of spice mix:
21/15 = 14/x
x = 10 teaspoons of salt.
Therefore, if there are 14 teaspoons of spice mix, 10 teaspoons of salt is there in it.
If 6 teaspoons of garlic powder are used then,
21-6 = 15 teaspoons of more salt is used
Therefore, 15 teaspoons of more salt is there than garlic powder if 6 teaspoons of garlic powder are used.
The answers of the given questions are:
20 teaspoons of salt is used with 8 teaspoons of garlic powder.If there are 14 teaspoons of spice mix, 10 teaspoons of salt is there in it. 15 teaspoons of more salt is there than garlic powder if 6 teaspoons of garlic powder are used.Learn more about ratio and proportion here:
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[tex] \sqrt{25} [/tex]what's the square root
Answers
[tex] \sqrt{25} [/tex] ()
what's the square root ?
√25 = 5
because 5*5= 25
[tex]\sqrt[]{5\cdot5}=\sqrt[]{5^2}=\text{ 5}[/tex]________________________
Answer
√25 = 5
After mark spent $24 on snacks for the movies, He had $12 left. How much money did mark start with?
Answers
We will investigate how to determine the amount of money Mark started off with at the beginning off the day.
We will assume and declare a variable to Mark's bank balance at the beginning off the day:
[tex]P\text{ = Inital balance}[/tex]Then mark sets out for movies and gets himself snacks to enjoy along his movies. The total receipt charged for his excursion is:
[tex]E\text{( expenses ) = \$24}[/tex]After his day expenses he will be left with a closing balance for the day. The closing balance of the day is expressed as:
[tex]\text{Closing Balance = Initial Balance - Expenses}[/tex]We are given that mark was left with $12. This means:
[tex]\text{Closing Balance = \$12}[/tex]Using the expression above we can write:
[tex]12\text{ = P - 24}[/tex]We will solve the above expression for initial balance ( P ) as follows:
[tex]\begin{gathered} P\text{ = 12 }+\text{ 24} \\ P\text{ = \$36} \end{gathered}[/tex]Therefore, the answer is:
[tex]\text{\$36}[/tex]Find the coefficient of third term of (x + 2)³. A. 40 OB. 10 OC. 20 D. 80 Reset Selection A
Answers
Given:
The expression given is,
[tex]\left(x+2\right)^5[/tex]Required:
To find the coefficient of the third term.
Explanation:
Let us expand the expression to find the coefficient.
[tex]\begin{gathered} \left(x+2\right)^5 \\ =\frac{5!}{5!}x^52^0+\frac{5!}{4!}x^42^1+\frac{5!}{2!3!}x^32^2+\frac{5!}{3!2!}x^22^3+\frac{5!}{4!1!}x^12^4+\frac{5!}{5!0!}x^02^5 \\ =x^5+10x^4+40x^3+80x^2+80x+32 \end{gathered}[/tex]Hence, the coefficient of the third term is 40.
Final Answer:
The coefficient of the third term is 40.
Option A is correct.
A marathon is 46,145 yards (about 26 miles) long. If Terrence has run 23,561 yards, estimate by rounding to thousands the number of yards he needs to run to complete the marathon.Terrence needs to run about ______ yards.
Answers
Given:
The length of the marathon is L= 46,145 yards.
The length covered by terrence is d = 23,561 yrads.
The objective is to find the remaining distance need to cover by terrence.
To calculate the remaining distance, we will use the relation,
[tex]x=L-d[/tex]On plugging the values in the above relation, we get,
[tex]\begin{gathered} x=46145-23561 \\ =22584\text{ yards} \\ \approx23000\text{ yards} \end{gathered}[/tex]Hence, Terrence needs to run about 23000 yards.
Simplify the expression √(112x^10 y^13 ). Show your work. please help
Answers
To create the abbreviated expression, combine similar terms by adding them all together. If the expression be [tex]$\sqrt{112 x^{10} y^{13}}$[/tex] then expression exists [tex]$4 \sqrt{7} x^5 y^6 \sqrt{y}$[/tex].
What is meant by an expression?Solving a math problem is the same thing as simplifying an expression. You basically strive to write an expression as simply as you can when you simplify it. In the conclusion, there shouldn't be any more multiplying, dividing, adding, or removing to do.
Start by recognizing the like terms, or terms with the same variables and exponents, in algebraic formulas. Then, to create the abbreviated expression, combine similar terms by adding them all together.
Let the expression be [tex]$\sqrt{112 x^{10} y^{13}}$[/tex]
separating the roots of the expression, we get
[tex]$\sqrt{112 x^{10} y^{13}}=\sqrt{112} \sqrt{x^{10}} \sqrt{y^{13}}$[/tex]
simplifying the above equation, we get
[tex]$=\sqrt{112} \sqrt{x^{10}} \sqrt{y^{13}}$[/tex]
Simplify [tex]$\sqrt{x^{10}}= x^5$[/tex]
[tex]$=\sqrt{112} x^5 \sqrt{y^{13}}$[/tex]
Simplify [tex]$\sqrt{y^{13}}=y^6 \sqrt{y}$[/tex]
[tex]$=\sqrt{112} x^5 y^6 \sqrt{y}$[/tex]
[tex]$=\sqrt{112}=4 \sqrt{7}$[/tex]
[tex]$=4 \sqrt{7} x^5 y^6 \sqrt{y}$[/tex]
Therefore, the correct answer is [tex]$4 \sqrt{7} x^5 y^6 \sqrt{y}$[/tex].
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Find an angle θ with 0∘<θ<360∘ that has the same:
Sine function value as 210∘
θ = _____ degrees
Cosine function value as 210∘
θ = ______ degrees
Answers
sin theta = -0.5 degrees
cos theta=-0.86 degrees
hope it helped
The volume for a rectangular prism is given by the formula V = l · w · h, where l is the length of the prism, w is the width of the prism, and h is the height of the prism.
If the volume of a rectangular prism with a height of 8 inches is 200 cubic inches and the base of the prism is a square, then what is the width of the rectangular prism?
A.
5 inches
B.
12.5 inches
C.
25 inches
D.
40 inches
Answers
If the volume of a rectangular prism with a height of 8 inches is 200 cubic inches and the base of the prism is a square, then the width of the rectangular prism is 5 inches
The volume of the rectangular prism = 200 cubic inches
The height of the rectangular prism = 8 inches
We know the volume of the rectangular prism = l×w×h
Where ls if the length of the base
w is the width of the base
h is the height of the rectangular prism
Given that the base of the prism is a square, then the length of the base is equal to width of the base
Consider
l = w = x
Substitute the values in the equation of volume
x × x × 8 = 200
[tex]x^{2}[/tex] × 8 = 200
[tex]x^{2}[/tex] = 25
x = 5 inches
Hence, if the volume of a rectangular prism with a height of 8 inches is 200 cubic inches and the base of the prism is a square, then the width of the rectangular prism is 5 inches
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Marsha thinks that because 123 is greater than 68, 0.123 must be greater than 0.68. Show and explain why Marsha is incorrect.
Answers
Let's begin by listing out the information given to us:
[tex]\begin{gathered} 123=1\text{0}0 \\ \text{ 20} \\ \text{ 3} \\ 123=1\text{ hundred + 2 tens + 3 units} \\ 68\text{ = 6 (10)} \\ \text{ 8} \\ 68\text{ = 6 tens + 8 units} \end{gathered}[/tex]To know which is greater between 0.123 To know which i3& 0.68, let's express it in tenth, hundredth & thousandth
[tex]\begin{gathered} 0.123=3\text{ thousandth + 2 hundredth + 1 tenth + 0 unit} \\ 0.123=0.003+0.02+0.1+0 \\ 0.68=\text{ 6 hundredth + 8 tenth + 0 unit} \\ 0.68=0.60+0.08+0 \end{gathered}[/tex]0.123 has 3 decimal places, which means it is 123/1000
0.68 has 2 decimal places, which means it is 68/100
When you multiply by 100, we have:
0.123 * 100 = 12.3
0.68 * 100 = 68
It becomes very evident that 0.68 is greater than 0.123
Which of the following is the correct equation for this function?
A. Y=-x²+3x - 4
B. Y= (x+1)(x-3)
c. Y= (x + 1)(x − 3)
D. Y + 1 = -(x − 3)²
Answers
Standard form of a parabola: y = a(x – h)^2 + k.
Since the parabola opens downwards, the leading coefficient, a, will be negative. This means option B can be ruled out as incorrect.
The vertex is at (1,4) and is also the maximum. As this is (h,k) in vertex form, you can start substituting values to find the equation. Start with y = -(x – 1)^2 + 4 and simplify by squaring the terms in parentheses and distributing the negative in front of the parentheses.
y = - (x-1)(x-1) + 4
= -(x^2 - x - x + 1) + 4
y = -x^2 + 2x + 3.
Also written as y = -(x + 1)(x - 3)
The graphed function is shown to cross the x-axis at -1 and 3.
I hope this helps a little!