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3 years ago

3w - (7w + 12) = 2(w – 3)how do u do this step by step

Mathematics

2 answers:

exis [7]3 years ago

3 0

3w-7w-12=2w-6

-4w-12=2w-6

-12=6w-6

-6=6w

w=-1

nata0808 [166]3 years ago

3 0

Answer:

w=-1

Step-by-step explanation:

3w-7w-12=2(w-3)

1) Combine alike terms:

-4w-12=2(w-3)

2) Use the Distributive property on the left side of the equation:

-4w+12=2w-6

3) Add a 6 to both sides:

-4w-6=2w

4) Add a 4w to both sides:

-6=6w

5) Divide both sides by 6:

w=-6/6

6) Simplify the fraction:

w=-1

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Step-by-step explanation:

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<h3>How to calculate the work done by the person?</h3>

Since person pushing a 40 pound box up an incline that is 30 degrees above the horizontal and 100 feet long, the work done, W is

W = mgh where

m = mass of box = 40 lb,
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h = height of incline = LsinФ where
L = length of incline = 100 ft and
Ф = angle of incline = 30°

So, W = mgh

W = mgLsinФ

So, substituting the values of the variables into the equation, we have

W = mgLsinФ

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W = 1280 lb-ft/s² × 50 ft

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So, the work done in pushing the box is 64000 lb-ft²/s²

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1 year ago

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3 years ago

3w - (7w + 12) = 2(w – 3)how do u do this step by step​

3w - (7w + 12) = 2(w – 3)how do u do this step by step