f(4) = 3×4^2+15
4^2=16
3×16
48+15
63
f(4)=63
Answer:
180 - 53.8 - 69.2 = 57°
<u><em>The answer has to be 30. </em></u>
<em>Correct me if I am incorrect but I would believe I am correct. Have a good one!</em>