Complementary angles add up to 90 (there should be a right angle in the diagram)
x+20+x+10 needs to equal 90 where x=30
Left angle is measured 30+20=50 degrees
Angle on the right is measured 30+10=40 degrees
Answer:
D.) 89.33°
Step-by-step explanation:
Use the inverse:

Insert this value into a calculator:

Round to the nearest hundredth:

The missing value is 89.33°.
There are 14 boys, therefore 16 girls.
Ratio of boys:girls is 14:16
14/16 = 7/8 so answer is the 3rd option.