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3 years ago

What value of ‘W’ satisfies 8(w+4)=38+7w A. 8 B.6 C.11 D. 4.5

Mathematics

1 answer:

dlinn [17]3 years ago

5 0

B. 6

Explanation: 8(6+4)= 80
38+ 7(6)= 80

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Algebraically solve the system of equations shown below. Note that you can use either factoring or the quadratic formula to find

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$6x^2+19x-15=-12x+15\\
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3 years ago

Read 2 more answers

A plane flew 525 miles in 1.75 hours. Find the average speed of the plane.

ale4655 [162]

We are trying to find the average speed of the plane, which is mph, or $\dfrac{\textrm{miles}}{\textrm{hour}}$ . Using proportions, we can find the average speed of the plane in mph:

$\dfrac{525 \,\, \textrm{miles}}{1.75 \,\,\textrm{hours}} = \dfrac{x \,\, \textrm{miles}}{1 \,\,\textrm{hour}}$

Use the information from the problem to create a proportion. Remember that we are looking for mph, so we will call that $x$ .

$\dfrac{525}{1.75} \,\textrm{miles} = x \,\textrm{miles}$

Multiply the entire equation by $1 \,\textrm{hour}$

$\dfrac{525}{1.75} = 300 = x$

Divide both sides of the equation by $1 \,\textrm{mile}$ to clear both sides of the mile unit

The average speed of the plane is 300 mph.

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3 years ago

I need help remembering the steps for 2x+5y=-7

dsp73

Get Y by itself so it' should look like this

5y=2x+7 after then you have divide 5 onto the right side and it should look like

Y=2/5x+7/5

7 0

3 years ago