How do you find either side length?

AB   = 87.71°

BC  = 82.42°

Step-by-step explanation:

your calculations of the angles are correct:

m∠A = 180° - 90° - 20° = 70°

using the sine rule (see attached graphic for reference)

AB / sin ∠C   =   AC / sin ∠B   =   BC / sin ∠A

we know AC = 30, substituting the values for ∠A, ∠B and ∠C gives us:

AB / sin 90°   =   30 / sin 20°   =   BC / sin 70°

Considering side AB:

AB / sin 90°   =   30 / sin 20°

AB  =   (30 / sin 20°) x sin 90° = 87.71

Considering side BC:

BC / sin 70°   =   30 / sin 20°

BC =  (  30 / sin 20°) x sin 70° = 82.42°

Hope this helps!

answer: $201

step-by-step explanation: to get the answer, you first get 3 nieces that he sold and multiply it by 67 and get $201, so he earned $201 selling his nieces.