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2 years ago

3x+15-7x=-7 solve for x

2 answers:

6 0

You can combine like terms:(3x and -7x)
-4x+15=-7
now, we subtract 15 from both sides:
-4x=-22
finally, we divide both sides by -4
x=5.5 or 5 1/2

xenn [34]2 years ago

5 0

3x+15−7x=−7

Simplify:

3x+15−7x=−7

3x+15+−7x=−7

(3x+−7x)+(15)=−7(Combine Like Terms)

−4x+15=−7

Subtract 15 from both sides.

−4x+15−15=−7−15

−4x=−22

Divide both sides by -4.

−4x/−4=−22/−4

x=11/2

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Step-by-step explanation:

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First we will calculate the hypotenuse using the x equation, since we know x = 1 mile (distance from the building on the ground) we have:

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Now we will calculate the height of the building using the y equation and so:

$y=rsin(\theta)\\\\y=\frac{1}{cos(2)} \times sin(2) = \frac{sin(2)}{cos(2)}=tan(2)=0.034921mi$

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