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3 years ago

What is the value of 7x squared + 2x when x = 3

Mathematics

1 answer:

Vadim26 [7]3 years ago

7 0

Answer:

The value of equation is 69 at x=3

Step-by-step explanation:

Given Equation:

$7x^2+2x$

We have to find the value of the expression at x=3

Putting the value of 'x' in the given equation.

= $7(3)^2+2(3)\\$

= $(7*9)+6\\63+6\\69$

The value of the above expression at x=3 is 69.

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Answer:

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Step-by-step explanation:

multiply 5 on both sides to cancel out the 5 and your left with x=10

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2 years ago

How many cubes with side lengths of 1/3 does it take to fill the prism?

Ugo [173]

Answer:

180 cubes

Step-by-step explanation:

little cubes:

$v=(\frac{1}{3} )^{3} =\frac{1}{27}$

The prism:

$v=(\frac{5}{3})(\frac{4}{3} )(2)=\frac{40}{9} =\frac{20}{3}$

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Hope this helps

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1 year ago

Ericka and her two sisters divided 915 stickers equally. About how many stickers did each girl receive?

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3 years ago

Two lines, A and B, are represented by the equations given below!

lara [203]

Answer:

The solutions to the system of equations are:

$y=-8,\:x=-4$

Thus, option C is true because the point satisfies BOTH equations.

Step-by-step explanation:

Given the system of the equations

$\begin{bmatrix}y=x-4\\ y=3x+4\end{bmatrix}$

Arrange equation variables for elimination

$\begin{bmatrix}y-x=-4\\ y-3x=4\end{bmatrix}$

$y-3x=4$

$-$

$\underline{y-x=-4}$

$-2x=8$

$\begin{bmatrix}y-x=-4\\ -2x=8\end{bmatrix}$

solve for x

$-2x=8$

Divide both sides by -2

$\frac{-2x}{-2}=\frac{8}{-2}$

$x=-4$

$\mathrm{For\:}y-x=-4\mathrm{\:plug\:in\:}x=-4$

$y-\left(-4\right)=-4$

$y+4=-4$

$y=-8$

The solutions to the system of equations are:

$y=-8,\:x=-4$

Thus, option C is true because the point satisfies BOTH equations.

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3 years ago