Help!
A. 5
B. 3
C. 4
D. 16
Answer: the andwer to that is C
Step-by-step explanation:
I need to know what is negative and whats positive.
There are two bags of marbles. The first contains one blue, one yellow and two reds. The seconds contains one red, one blue and two yellows. A random marble from each bag is removed. What is the probability of removing a blue and yellow? Give answer as a fraction.
Answer:
3/16
We assume that the marbles are drawn without replacement.
P(blue and yellow)
= P(b1 and y2) + P(y1 and b2)
= P(b1) P(y2) + P(y1) P(b2)
= (1/4)(1/2) + (1/4)(1/4)
= 1/8 + 1/16 = 2/16 + 1/16 = 3/16
Suppose times for the 100m sprint for the average person are Uniondale and symmetric with mean 14 seconds and standard deviation 0.8 seconds. What is the probability that the average person has a time faster than Usain Bolt’s record of 9.58 seconds?
The probability that the average person has a time faster than Usain Bolt’s record of 9.58 seconds
P(x>9.58)=1
This is further explained below.
What is the probability?Mean[tex](\mu)[/tex]=14 seconds
Standard deviation[tex](\sigma)[/tex]=0.8 seconds
To determine the likelihood that the average individual will beat Usain Bolt's record of 9.58
To express the statement "the probability that the average person has a time faster than Usain Bolt’s record of 9.58 seconds" in a mathematical equation we have:
[tex]&P(x > 9.58)=P\left(\frac{x-\mu}{\sigma} > \frac{9.58-14}{0.8}\right) \\\\&P(x > 9.58)=P\left(z > -\frac{4.42}{0.8}\right) \\\\ &P(x > 9.58)=P(z > -5.525)[/tex]
P(x>9.58)=1
Note: we would make use of the normal table in reading z>-5.525
In conclusion, By using standard normal distribution we get
P(x>9.58)=1
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The water pressure on a submerged object is given by P = 64d, where P is the pressure in pounds per square foot, and d is the depth of the object in feet.
a. solve the formula for d.
b. Find the depth of a submerged object if the pressure is 672 pounds per square foot.
60 and 274.
Step-by-step explanation:
Consider the expressions (2.4 x 10/8) and (9.2 x 10/6) Find the difference of the expressions.
Find the product of the expressions
The difference of the values is -12.9 while the product of the expression is 45.9
How to solve for the differenceWe have to solve for
2.4 x 10/8
= 2.4 x 1.25
= 3
(9.2 x 10/6)
= 9.2 x 1.667
= 15.3
The difference between the values wpuld be
3 - 15.3
= -12.3
The product of the expressions would be solved by
3 x 15.3
= 45.9
Hence we would say that the difference that is in the values that we have here is -12.9 while the product of these values is given as 45.9
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There was a big snowstorm on Friday night. By Saturday afternoon, 3 inches of the snow had melted. There were still 8 inches of snow left. Solve an equation to find how many inches of snow fell during the snowstorm.
Answer:
13 correct me if i am wrong
Step-by-step explanation:
Only 1 and 9 please show work THANK YOU
Simplification of the given expression to single complex number are as follow :
1. 3i
2. 4i
3. 24
4. 15
5. 1 + √3 i
6. 2 + [tex]\sqrt{5}i[/tex]
As given,
Simplify the following expression to a single complex number,
1) [tex]\sqrt{-9}[/tex] = [tex]\sqrt{9}\sqrt{-1}[/tex] = 3i
where i is the complex number representing [tex]\sqrt{-1}[/tex]
2) √-16 = 4i
3) √-6 √-24
= √6 ×6 ×4
= 6 ×4
= 24
4) √-3 √-75
=√ 3×75
= √3 × 3 ×25
= 3 ×5
=15
5) [tex]\frac{2 +\sqrt{-12} }{2}[/tex]
= (2 + 2√-3) /2
= 1 + √3 i
6) [tex]\frac{4+\sqrt{-20}}{2}[/tex] = [tex]\frac{4+\sqrt{20}\sqrt{-1}}{2}[/tex] = [tex]\frac{4+(2\sqrt{5}\sqrt{-1})}{2}[/tex] = [tex]\frac{4+(2\sqrt{5}i)}{2}[/tex] = [tex]\frac{2(2+\sqrt{5}i)}{2}[/tex] = 2 + [tex]\sqrt{5}i[/tex]
where i is the complex number representing [tex]\sqrt{-1}[/tex]
Therefore, simplification of the given expression to single complex number are as follow :
1. 3i
2. 4i
3. 24
4. 15
5. 1 + √3 i
6. 2 + [tex]\sqrt{5}i[/tex]
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What is the equation of the line that passes through the point (5, -4) and
has an undefined slope?
Answer:
x=5
Step-by-step explanation:
If the slope is undefined, it is a vertical line. Since the slope-intercept equation is y=mx+b, but the slope is undefined, the equation would have to be the x coordinate, because that is the unchanging variable in a vertical line. So, the answer is x=5.
help meeeeeeee please
The value of the average price per square foot in 2002 is $101. 5
What is a function?A function can simply be defined as a rule, a law, an equation or an expression that is made up of two variables and shows or explains the relationship between them.
The variables are;
Independent variableDependent variableGiven the function;
P(t) = 0. 018t³ - 0. 294t² + 3. 065t + 55. 190
Where;
P is the average price per square feett is the number of years since 1992For the year 2002 , the value of t would be 10
Substitute the value into the formula
P(10) = 0. 018(10)³ - 0. 0294(10)² + 3. 05(10) + 55. 190
expand the bracket, we have
P(10) = 0. 018(1000) - 0. 0294(100) + 30. 5 + 55. 90
multiply through
P(10) = 18 - 2. + 30. 5 + 55. 90
Add the values
P(10) = $101. 5
Hence, the value is $101. 5
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Brainliest po kapag tama, Please help na po, Need na po talaga.
Directions: Solve for the number of subsets of the following items. Input your answer inside the box provided for each item.
1. A = {U, S, T, A, C}
2. B = {red, blue, yellow}
1) If A = {U, S, T, A, C}, then the Subsets of {U, S, T, A, C} are;
as detailed below
2) If B = {red, blue, yellow}. then the Subsets of {red, blue, yellow} are;
as detailed below
What are the subsets?Subsets are a part of one of the mathematical concepts called Sets. For example If a set A is a collection of odd numbers and set B consists of {1,3,5}, then B is said to be a subset of A.
Thus;
1) Subsets of {U, S, T, A, C} are;
{U}, {S}, {T}, {A}, {C},
{U, S}, {U, T}, {S, T}, {U, A}, {S, A}, {T, A}, {U, C}, {S, C}, {T, C}, {A, C},
{U, S, T}, {U, S, A}, {U, T, A}, {S, T, A}, {U, S, C}, {U, T, C}, {S, T, C}, {U, A, C}, {S, A, C}, {T, A, C},
{U, S, T, A}, {U, S, T, C}, {U, S, A, C}, {U, T, A, C}, {S, T, A, C},
{U, S, T, A, C}
2) Subsets of {red, blue, yellow} are;
{Red}, {Yellow}, {Blue},
{Red, Yellow}, {Red, Blue}, {Yellow, Blue},
{Red, Yellow, Blue}
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A(-3,-2) and M (2,6) find the coordinates of the other endpoint
The other endpoint of the segment is (7, 14)
How to determine the coordinate of the other endpoint?From the question, we have:
On the segment, we have the following endpoints
Endpoint 1, A = (-3,-2)
Midpoint, M = (2,6)
The midpoint of the segment is calculated using
Midpoint (x, y) = 1/2 * (x1 + x2, y1 + y2)
Where
(x1, y1) = (-3,-2)
(x, y) = (2,6)
Substitute the known values in the above equation
So, we have
(2, 6) = 1/2 * (-3 + x, -2 + y)
Multiply both sides of the equation by 2
So, we have
(4, 12) = (-3 + x, -2 + y)
By comparison, we have
-3 + x = 4
-2 + y = 12
Evaluate the like terms in the above equation
So, we have
x = 7
y = 14
When the above solution is represented as a coordinate, we have the following
(x, y) = (7, 14)
Hence, the other endpoint of the segment where the segment has the endpoint (-3,-2) and midpoint (2,6) is (7, 14)
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On a map which is a scale of 1 inch to 12 feet the area of the restaurant is 60 and two squared Han says the actual area of the restaurant is 720 ft.² do you agree or disagree? Explain your reasoning.
Han is therefore mistaken in what he claims. The area is 8640 [tex]feet^{2}[/tex]
What is area?The measurement that expresses the size of a region on a plane or curved surface is called area. Surface area refers to the area of an open surface or the boundary of a three-dimensional object, whereas the area of a plane region or plane area refers to the area of a form or planar lamina.
Given Data
Let "x" represent the restaurant's actual space.
You are aware that the map's scale is 1 inch to 12 feet. As a fraction, this is written as follows:
[tex]\frac{1inch}{12feet}[/tex]
Calculate the restaurant's scale drawing area. Such is:
([tex]\frac{1inch}{12feet}[/tex]) ² = [tex]\frac{1inch^{2} }{144feet^{2} } }[/tex]
We can set up this percentage and then solve for "x" to determine the precise location of the restaurant because the restaurant's location is indicated on the map.
Such is:
[tex]\frac{144}{1}[/tex] = [tex]\frac{x}{60}[/tex]
60 (144) = x
x = 8640 [tex]feet^{2}[/tex]
Han is therefore mistaken in what he claims.
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SOmE ONE PLEASE PLEASE I BEG HELP on number 4.
The absolute value function as piecewise function of y = -3(x + 24)/4 and y = 3(x - 38)/4
The absolute value function is commonly understood as a function providing the distance the number is from zero on a number line.
y = 3/4|x-6|-8
y = 3/4(-(x-6))-8
y= 3/4( -x + 6) -8
y = 3(-x + 6 - 32)/4
4y = -3x - 24
y = -3(x + 24)/4
For another function of y
y = 3/4|x-6|-8
y= 3/4( x - 6) -8
y = 3(x - 6 - 32)/4
4y = 3(x - 38)
y = 3(x - 38)/4
The absolute value function as piecewise function of y = -3(x + 24)/4 and y = 3(x - 38)/4
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A store sells juice in different sizes. Determine which size is the best buy and the unit price.8 oz $2.4024 oz $6.4864 oz $14.08
To determine which is the best buy, we need to first find the unit price of each
8 oz $2.40
Unit price
$2.40/8 = $0.3
1 oz = $0.3
24 oz $6.48
Unit price
$6.48/24 =$0.27
1 oz = $0.27
64 oz $14.08
Unit price
$14.08/64 =$0.22
From the above the best best buy is the one with the lowest price which is $0.22
The best buy is;
64 oz $14.08
and the unit rate is $0.22 per oz
Find a formula for the nth term in this
arithmetic sequence:
a1 = 8, a2 = 4, a3 = 0, a4 = -4, ..
Answer:
an = -4n +12
Step-by-step explanation:
the nth term in this arithmetic sequence is : an = a1 + (n -1 )d
a1 = 8 d = a2-a1 = 4-8 = -4 ( common difrence)
an = 8 + (n -1 )(-4) = 8 - 4n +4
an = -4n +12
1.25x + 1.49 = 100.
The value of x comes to 78.808 after solving the given expression 1.25x + 1.49 = 100.
What are expressions?Mathematical expressions consist of at least two numbers or variables, at least one math operation, and a sentence. It's possible to multiply, divide, add, or subtract with this mathematical operation. An expression's structure is as follows: Expression: (Math Operator, Number/Variable, Math Operator)A single term or a collection of terms can be used to create an algebraic expression. For instance, 4x and y are the two terms in the expression 4x + y.So, 1.25x + 1.49 = 100:
Now, solve as follows:
1.25x + 1.49 = 1001.25x = 100 - 1.491.25x = 98.51x = 98.51/1.25x = 78.808Therefore, the value of x comes to 78.808 after solving the given expression.
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y=x2^+9x+7 in vertex form
Answer: (-9/2,-53/4)
Step-by-step explanation:
Answer:
[tex]y=\left(x+\dfrac{9}{2}\right)^2-\dfrac{53}{4}[/tex]
Step-by-step explanation:
Vertex form of a quadratic equation:
[tex]\boxed{y=a(x-h)^2+k}[/tex]
where:
(h, k) is the vertex.a is the leading coefficient.To find the vertex form of a quadratic equation, complete the square.
Given quadratic equation:
[tex]y=x^2+9x+7[/tex]
Add and subtract the square of half the coefficient of the term in x to the right side of the equation:
[tex]\implies y=x^2+9x+\left(\dfrac{9}{2}\right)^2+7-\left(\dfrac{9}{2}\right)^2[/tex]
[tex]\implies y=x^2+9x+\dfrac{81}{4}+7-\dfrac{81}{4}[/tex]
[tex]\implies y=x^2+9x+\dfrac{81}{4}-\dfrac{53}{4}[/tex]
Factor the perfect square trinomial formed by the first 3 terms:
[tex]\implies y=\left(x+\dfrac{9}{2}\right)^2-\dfrac{53}{4}[/tex]
Can you give me two examples of a absolute value parent function
SOLUTION:
Step 1:
In this question, we are given the following:
Can you give me two examples of an absolute value parent function?
Step 2:
What is the parent function for absolute value?
An absolute value function is a function that contains an algebraic expression within absolute value symbols. Recall that the absolute value of a number is its distance from 0 on the number line.
Examples include:
1. The absolute value parent function, written as: f(x)=| x |, is defined as:f(x)={x if x>00 if x=0−x if x<0.
[tex]f(x)\text{ =}\lvert x\rvert[/tex], is defined as:
[tex]f(x)\text{ =}\lvert x\rvert[/tex][tex]\begin{gathered} f(x)\text{ =}\lvert x\rvert \\ \text{if x > 0, then f(x) = x} \\ \text{if x < 0, then f(x) = x} \end{gathered}[/tex]2. The second example of absolute value function is:
[tex]f(x)\text{ =}\lvert\sin x\rvert[/tex]Let f(x)=x^2-5x and g(x)=3-x find (fg)(4)
Given:
[tex]\begin{gathered} f\mleft(x\mright)=x^2-5x \\ g\mleft(x\mright)=3-x \end{gathered}[/tex]Required:
Find (fg)(4)
Explanation:
Given functions are
[tex]\begin{gathered} f(x)=x^{2}-5x \\ g\mleft(x\mright)=3-x \end{gathered}[/tex][tex]\begin{gathered} (fg)(4)=f(4)g(4) \\ (fg)(4)=[(4)^2-5(4)][3-4] \\ (fg)(4)=[16-20](-1) \\ (fg)(4)=(-4)(-1_) \\ (fg)(4)=4 \end{gathered}[/tex]Final answer:
The value of (fg)(4) = 4
Find the equation of the line having
undefined slope and passing through (0,5).
Answer:
x = 0
Step-by-step explanation:
A line that has undefined slope is a vertical line. A vertical line has an equation in the form "x = anumber"
In the given information, (0,5), x is 0 and y is 5. What we need is the information on x.
x is 0.
x = 0 is the equation of the line.
Answer:
x=0.
Step-by-step explanation:
undefined slope is a vertical line. if it passes through (0,5) it means its on the y line
Find two pairs of conjugates with a product of 3. Please
The two pairs of conjugates are ([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex]).
What is the conjugates pair?In mathematics, a pair of binomials with identical phrases that part opposite arithmetic operators in the midst of these similar terms are referred to as conjugates. Below are a few more instances of conjugate pairs: p + q, p - q. 3 + 1, 3 - 1. 4 - 3i, 4 + 3i.
Let the two pair of conjugates is
([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex])
Use the formula,
(a+b) and (a-b) = [tex]a^{2}-b^{2}[/tex]
Then,
([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex]) = [tex]\sqrt{2} ^{2}-i^{2}[/tex]
We know that,
[tex]i^{2}=-1[/tex]
([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex]) = 2-(-1)
([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex]) = 3
Hence, The two pairs of conjugates are ([tex]\sqrt{2}-i[/tex]) and ([tex]\sqrt{2}+i[/tex]) with a product 3 .
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According to the solving the two pairs of conjugates with a product of 3:
(√2 - i ) & (√2 + i ).
What does "pair of conjugates" mean?When two binomials are identical except for the signs separating the terms, they are said to be conjugates. You only need to rephrase a binomial and alter the sign of the second term to create its conjugate.
According to the given data:given number = 3.
lets the two pair of conjugates is:
(√2 - i ) & (√2 + i )
Use the formula:
a² - b² = (a + b) and (a - b)
So,
(√2 - i ) & (√2 + i ) = (√2)² -( i )²
We know that,
i² = -1
So,
(√2 - i ) & (√2 + i ) = 2 - (-1)
(√2 - i ) & (√2 + i ) = 3
According to the solving the two pairs of conjugates with a product of 3:
(√2 - i ) & (√2 + i ).
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An arch is in the shape of a parabola. It has a span of 72 meters and a maximum height of 9 meters.
Answer:
Equation of the parabola:
[tex]y=-\frac{1}{144}x^2+9[/tex]The height of the arch 18 meters from the center is 6.75m
Explanation:
The arch feet are 72m apart and the origin half way between them. This means that the axis of symmetry (or the x.coordinate of the vertex) is x = 0
Since it's an arch, the parabola is concave down, with it's maximum at the vertex, y = 9. This means that the vertex is at (0, 9). Also, we can see that the y-intercept is y = 9
Finally, we know the two roots of the parabola: x = -36 and x = 36. This is because the points x = -36 and x = 36 are 72m apart, with the center at the original, as the problem says. SInce x = 36 is a root, this means that at that point the y value is 0.
With all this, we can try to find the general form of a parabola. The general form is:
[tex]y=ax^2+bx+c[/tex]c is the y-intercept. We know that c = 9
We can find the value of b, because we know the coordinates of the vertex. The x-coordinate of the vertex is:
[tex]x_{vertex}=-\frac{b}{2a}[/tex]SInce the x-coordinate of the vertex is x = 0
[tex]0=-\frac{b}{2a}[/tex]If we solve:
[tex]b=0[/tex]So far we have:
[tex]y=ax^2+9[/tex]Finally, to find a, we can use the point (36, 0) (one of the roots)
[tex]0=a(36)^2+9[/tex]And solve:
[tex]\begin{gathered} 324a=-9 \\ . \\ a=-\frac{9}{1296}=-\frac{1}{144} \end{gathered}[/tex]Thus, the equation of the arch is:
[tex]y=-\frac{1}{144}x^2+9[/tex]Evaluating this equation for x = 18, we can find the height of the arch:
[tex]y=-\frac{1}{144}(18)^2+9=-\frac{9}{4}+9=-6.75[/tex]There are 3 circles and 9 squares. What is the simplest ratio of circles to squares?
Answer:
1 is to 3
Find the lowest common factor of both numbers, which is 3. Then divide it into both numbers
1. the interest on $2,00 for 2 years is 320 what is the simples interest rate
2. if the interest earned on an account after 2 years is $15, how much would it be after 10 years?
1. The simple interest rate is 80%
2. The interest earned on the account after 10 years is $75
What is simple interest?Simple interest can be defined as a mathematical or arithmetic method of calculating the charge of interest on a given loan.
The formula for simple interest is expressed as;
I = PRT/100
Where;
I is the simple interestP is the principal or initial amountR is the interest rateT is the time taken for the interestFrom the information given, we are to determine the interest rate, R
Substitute the values into the formula, we have;
320 = 200 × R × 2/100
Now, cross multiply, we have;
320(100) = 400R
Find the product of the values
400R = 32000
Divide both sides by the coefficient of the interest rate, we get
R = 32000/400
Find the quotient
R = 80%
If the interest for 2 years is $15
Then in 10 years = $x
cross multiply
x = 150/2
Find the quotient
x = $75
Hence, the rate is 80%
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3. Perform the indicated operation. Show all necessary work.
(a) -1.424-2.9
(b) 1.424-(-2.9)
(c) -1.424-(-2.9) -0.576
Answer:
The result of the indicated operations are:
(a) -4.324.
(b) 4.324.
(c) 0.9
What are operations on decimals?Addition, subtraction, multiplication, and division are the basic operations on decimals.We shall first convert the decimal integers to like decimals before adding and subtracting them. Decimals having the same number of decimal places are said to be like decimals. The decimal points of the addends will be aligned, and if necessary, zeroes will be added at the end of one number to equalize the decimal places. then carry on adding (or removing) as usual. The decimal point should be positioned exactly where it is in the extra numbers in the response (or subtracted)(a) -1.424-2.9
Calculate the sum of the decimals,
The result is -4.324.
(b) 1.424-(-2.9)
Remove the bracket and change the sign in the middle and add the decimals to get the sum,
1.424 + 2.9 = 4.324.
(c) -1.424-(-2.9) -0.576
Remove the parentheses and change the sign,
-1.424 + 2.9 - 0.576
Add the negative decimal numbers and subtract them from the positive decimal number.
-2 + 2.9 = 0.9
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2. Jay needs 19 quarts more paint for the outside of his barn than for the inside. If he uses 107 quarts in all,
how many gallons of paint will be used to paint the inside of the barn?
4 gallons of paint will be used to paint the inside of the barn.
What is equation?In algebra, an equation is a declaration of equivalence that includes one or more variables or unknowable quantities.
Given Data
Jay needs 19 quarts more paint for the outside of his barn than for the inside.
he uses 107 quarts in all
Paint needed for Inside = x
Paint needed for outside = x + 19
So,
Total paint = Paint for outside + Paint for inside
107 = x + x+ 19
107 = 2x + 19
2x = 88
x = 44
Number of gallon = [tex]\frac{44}{4}[/tex]
Number of gallon = 4
4 gallons of paint will be used to paint the inside of the barn.
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EX: Let X₁ and X₂ have the ķ $ joint proib. density function. f(x₁, x₂ ) = [ Kx1,x2, 0<=x1,<=1,0<=x2<=1 and 0 elsewhere.find the value of k
Answer:
17
Step-by-step explanation:
To find k, we use
∫∞−∞∫∞−∞fXY(x,y)dxdy=1.
Thus, we have
1=∫∞−∞∫∞−∞fXY(x,y)dxdy=∫10∫10x+cy2dxdy=∫10[12x2+cy2x]x=1x=0dy=∫1012+cy2dy=[12y+13cy3]y=1y=0=12+13c.
Therefore, we obtain c=32.
To find P(0≤X≤12,0≤Y≤12), we can write
P((X,Y)∈A)=∬AfXY(x,y)dxdy,for A={(x,y)|0≤x,y≤1}.
Thus,
P(0≤X≤12,0≤Y≤12)=∫120∫120(x+32y2)dxdy=∫120[12x2+32y2x]120dy=∫120(18+34y2)dy=332.
We can find marginal PDFs of X and Y from their joint PDF. This is exactly analogous to what we saw in the discrete case. In particular, by integrating over all y's, we obtain fX(x). We have
Marginal PDFs
fX(x)=∫∞−∞fXY(x,y)dy, for all x,fY(y)=∫∞−∞fXY(x,y)dx, for all y.
Example
In Example 5.15 find the marginal PDFs fX(x) and fY(y).
Answer:
17
Step-by-step explanation:
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Given the function h(x) = x^2 – 7x + 6, determine the average rate of change of the function over the interval 3 < x < 7.hurry please need answer.
Answer:Explanation:
The average rate of change = 3
The average rate of change for a function f(x) is an intervale a < x < b can be calculated using the following equation:
[tex]\frac{f(b)-f(a)_{}}{b-a}[/tex]Therefore, the average rate of change of the function h(x) = x^2 – 7x + 6 in the interval 3 < x < 7 is:
[tex]\frac{h(7)-h(3)}{7-3}[/tex]Where h(7) and h(3) are equal to:
[tex]\begin{gathered} h(7)=7^2-7(7)+6 \\ h(7)=49-49+6 \\ h(7)=6 \\ h(3)=3^2-7(3)+6 \\ h(3)=9-21+6 \\ h(3)=-6 \end{gathered}[/tex]So, the average rate of change is:
[tex]\frac{6-(-6)}{7-3}=\frac{6+6}{4}=\frac{12}{4}=3[/tex]Therefore, the answer is 3.
Find the value of x so that f(x) = 7.
For the given function f(x) = 7 , the value of x is 5.
solution:
We have a linear function in the figure, and linear functions have the same slope for all values of. We can determine the value of f using the secant line equation:
(yB -yA) / (xB - xA) = (yC - yA) / (xC - xA)
Where:
(xA , yA) , (xB , yB) given
to find , (xC , yC)
(xA , yA) = (2,0) , (xB , yB) = (5,7) and yC = 7
to find xC ,
xC - xA = (yC - yA) / (yB - yA) . (xB - xA)
xC = xA + (yC - yA) / (yB - yA) . (xB - xA)
xC = 2 + (7-0)/(7-0) x (5 - 2)
xC = 2 + (5 - 2)
xC = 2 + 3
xC = 5
so the value of x in given function f(x) = 7 is 5.
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