One hundred meters of fencing is available to inclose a rectangular area next to a river (see figure above). Give a function A that can represent the area that can be enclosed in terms of x.

A=2x(-x+50)

Step-by-step explanation:

Since there is a river, you only need to fence 3 sides of the rectangular area.

Let's name x the shorter side of the rectangular area. (height)

Hence, since we have 100 meters of fencing, the longer side of the rectangle would be 100-2x (base)

Area is base*height.

Hence, our equation would be:

A=x(100-2x)

Simplify

A=100x-2x^2

A=2x(-x+50)

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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ummm seems that u didnt post the attachement !