7. In an orchestra, the ratio of trombones to violas is 4:6. There are 9 violas. Write and solve a proportion to determine how many trombones are in the orchestra.

6 trombones

Step-by-step explanation:

We can set up a proportion.

Let x be the number of trombones there are.

We can cross multiply:

4*9 = 6x

6x = 36

Divide both sides by 6:

x = 6

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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f

step-by-step explanation:

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