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timofeeve [1]
3 years ago
7

Help sorry nothing was attached last time

Mathematics
1 answer:
kicyunya [14]3 years ago
8 0

Given:

The area of a rectangle is 99 square yd.

Length of the rectangle = 7 yd more than twice the width.

To find:

The dimensions of the rectangle.

Solution:

Let x be the width of the rectangle. Then, length of the rectangle is:

Length=2x+7

Area of a rectangle is:

A=length\times width

A=(2x+7)\times x

A=2x^2+7x

The area of a rectangle is 99 square yd.

2x^2+7x=99

2x^2+7x-99=0

Splitting the middle term, we get

2x^2+18x-11x-99=0

2x(x+9)-11(x-9)=0

(x+9)(2x-11)=0

Using zero product property, we get

(x+9)=0 and (2x-11)=0

x=-9 and x=\dfrac{11}{2}

x=-9 and x=5.5

Width of the rectangle cannot be negative. So, x=5.5 yd.

Now, the length of the rectangle is:

Length=2x+7

Length=2(5.5)+7

Length=11+7

Length=18

Therefore, the length of the rectangle is 18 yd and the width of the rectangle is 5.5 yd.

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Let x and y be the rate per hour for Mechanic 1 and 2 respectively.

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