Translate into an algebraic expression: 22 decreased by y%

We have to decrease 22 by y%.

First we need to calculate what is y% of 22. y% of 22 simply means y% into 22 i.e.

y% x 22

= 0.01(y) x 22

= 0.22y

So 0.22 y is the y% of 22. Now we have to decrease 22 by its y% which becomes:

22 - y% of 22

= 22 - 0.22y

This expression can also be written as:

22 ( 1 - 0.01y)

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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