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3 years ago

What does m equal to: -1/3m+1=-7

2 answers:

7 0

<span>- 1/3m + 1= - 7
=> -1/3m = - 7 - 1
=> - 1/3 m = -8
=> - m = -8 * 3
=> -m = - 24
=> m = 24

Hope it helps !!!</span>

otez555 [7]3 years ago

5 0

-1/3m+1=-7
-1/3m+1-1=-7-1 subtract 1 from both sides
-3(-1/3m)=-3(-8) multiply -3 on both sides
m=24 solution

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Answer:

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Length: 720 feet

Step-by-step explanation:

So we start with the equation to find the perimeter -

2l + 2w = p

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We insert the 2,340 ft as the perimeter -

2l + 2w = 2,340 ft

Now we find another equation for the "length is 270 ft greater than width" -

l = 270 ft + w

Using substitution, we substitute the y in the first equation with 270 ft + w -

2 (270 ft + w) + 2w = 2,340 ft

540 ft + 2w + 2w = 2,340 ft

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4w = 2,340 ft - 540 ft

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Now to find the width we substitute the w with 450 ft -

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Check -

2 * 720 ft + 2 * 450 ft = 2,340 ft

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3 years ago

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Vlad [161]

Answer:

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Explanation:

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3 years ago

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Step-by-step explanation:

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3 years ago

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andrezito [222]

Answer:

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Step-by-step explanation:

The formula that is used to calculate the area of a rectangle is:

$A=lw$

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You know that the area of that rectangle is:

$A=744\ cm^2$

And, according to the exercise, its lenght is 7 more than its width; then:

$l=w+7$

Then, you can make the corresponding substitution into the formula $A=lw$ :

$744=(w+7)w$

Simplify:

$744=w^2+7w\\\\w^2+7w-744=0$

Factor the equation. Find two numbers whose sum is 7 and whose product is -744. These are 31 and -24.

Then, you get:

$(w-24)(w+31)=0\\\\w_1=24\\\\w_2=-31$

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$w=24\ cm$

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