Iwill give brainliest

solve the following proportion.

r/5 = 9/21

a. r = 2.14

b.4 = 9

c. r = 11.66

d. r = 37.8

The answer is A.

Hope this helps.

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°