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defon
3 years ago
9

PLEASE HELP ASAP!!! CORRECT ANSWERS ONLY PLEASE!!!

Mathematics
2 answers:
Ahat [919]3 years ago
8 0

Answer:

The answer is -x^2+7x+1 I think

Step-by-step explanation:


Viktor [21]3 years ago
8 0

Answer: (D) y = x² + 7x + 1

<u>Step-by-step explanation:</u>

Since a table of x,y-values are given, choose a coordinate and plug it into each equation to see which results in a true statement.  If more than one equation is true, then choose another coordinate and plug it into the true equations from the previous coordinate.

Let's try (0, 1):

(A) y = x² - 7x - 1

    1 = (0)² - 7(0) - 1

    1 = -1

   FALSE, So A is not the quadratic equation we are looking for

(B) y = x² - 7x + 1

    1 = (0)² - 7(0) + 1

    1 = 1

    TRUE, So B could be the quadratic equation we are looking for

(C) y = -x² + 7x + 1

    1 = -(0)² + 7(0) + 1

    1 = 1

    TRUE, So C could be the quadratic equation we are looking for

(D) y = x² + 7x + 1

    1 = (0)² + 7(0) + 1

    1 = 1

    TRUE, So D could be the quadratic equation we are looking for

Let's try (1, 9) for B, C, and D:

(B) y = x² - 7x + 1

    9 = (1)² - 7(1) + 1

    9 = -5

    FALSE, So B is not the quadratic equation we are looking for

(C) y = -x² + 7x + 1

    9 = -(1)² + 7(1) + 1

    9 = 7

    FALSE, So C is not the quadratic equation we are looking for

(D) y = x² + 7x + 1

    9 = (1)² + 7(1) + 1

    9 = 9

    TRUE, So D is the quadratic equation we are looking for!


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Does the table show a direct proportional relationship? If so, what is the constant of proportionality?
lesantik [10]

Answer:

C. Yes, 3.5.

Step-by-step explanation:

If there is a relationship of direct proportionality for every ordered pair of the table, then the constant of proportionality must the same for every ordered pair. The constant of proportionality (k) is described by the following expression:

k = \frac{y}{x} (1)

Where:

x - Input.

y - Output.

If we know that (x_{1}, y_{1}) = (13, 45.5), (x_{2}, y_{2}) = (14, 49) and (x_{3}, y_{3}) = (15, 52.5), then the constants of proportionalities of each ordered pair are, respectively:

k_{1} = \frac{y_{1}}{x_{1}}

k_{1} = \frac{45.5}{13}

k_{1} = \frac{7}{2}

k_{2} = \frac{y_2}{x_2}

k_{2} = \frac{49}{14}

k_{2} = \frac{7}{2}

k_{3} = \frac{y_{3}}{x_{3}}

k_{3} = \frac{52.5}{15}

k_{3} = \frac{7}{2}

Since k_{1} = k_{2} = k_{3}, the constant of proportionality is 3.5.

8 0
3 years ago
Simplify each expression. <br>(4 - 2i) - (-3 + i) ​
PtichkaEL [24]

Answer:

2i - (-3 + i)

Step-by-step explanation:

I think this is it. Sorry if it's wrong

7 0
2 years ago
Read 2 more answers
In Exercises 45–48, let f(x) = (x - 2)2 + 1. Match the<br> function with its graph
MA_775_DIABLO [31]

Answer:

45) The function corresponds to graph A

46) The function corresponds to graph C

47) The function corresponds to graph B

48) The function corresponds to graph D

Step-by-step explanation:

We know that the function f(x) is:

f(x)=(x-2)^{2}+1

45)

The function g(x) is given by:

g(x)=f(x-1)

using f(x) we can find f(x-1)

g(x)=((x-1)-2)^{2}+1=(x-3)^{2}+1

If we take the derivative and equal to zero we will find the minimum value of the parabolla (x,y) and then find the correct graph.

g(x)'=2(x-3)

2(x-3)=0

x=3

Puting it on g(x) we will get y value.

y=g(3)=(3-3)^{2}+1

y=g(3)=1

<u>Then, the minimum point of this function is (3,1) and it corresponds to (A)</u>

46)

Let's use the same method here.

g(x)=f(x+2)

g(x)=((x+2)-2)^{2}+1

g(x)=(x)^{2}+1

Let's find the first derivative and equal to zero to find x and y minimum value.

g'(x)=2x

0=2x

x=0

Evaluatinf g(x) at this value of x we have:

g(0)=(x)^{2}+1

g(0)=1

<u>Then, the minimum point of this function is (0,1) and it corresponds to (C)</u>

47)

Let's use the same method here.

g(x)=f(x)+2

g(x)=(x-2)^{2}+1+2

g(x)=(x-2)^{2}+3

Let's find the first derivative and equal to zero to find x and y minimum value.

g'(x)=2(x-2)

0=2(x-2)

x=2

Evaluatinf g(x) at this value of x we have:

g(2)=(2-2)^{2}+3

g(2)=3

<u>Then, the minimum point of this function is (2,3) and it corresponds to (B)</u>

48)

Let's use the same method here.

g(x)=f(x)-3

g(x)=(x-2)^{2}+1-3

g(x)=(x-2)^{2}-2

Let's find the first derivative and equal to zero to find x and y minimum value.

g'(x)=2(x-2)

0=2(x-2)

x=2

Evaluatinf g(x) at this value of x we have:

g(2)=(2-2)^{2}-2

g(2)=-2

<u>Then, the minimum point of this function is (2,-2) and it corresponds to (D)</u>

<u />

I hope it helps you!

<u />

8 0
3 years ago
What is the radius of the cylinder ?
djyliett [7]

Answer:

The radius is 1

Step-by-step explanation:

7 0
3 years ago
julie has 10 yards of ribbon she divides the ribbon into 3 equal pieces and uses 2 of the pieces on gifts how much ribbon does s
Lunna [17]

Answer:

2/3

Step-by-step explanation:

if we divide 10 by 3 then we get 3.3 repeating so just use the fraction 1/3. if you use 2 of the divided lengths then you get 2/3

4 0
3 years ago
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