need help with these questions

Question

1)  Find the measure of <A in ΔABC where a = 29.6,       

b = 30.8, and <B = 53.9°.

2)  Find the measure of <A in ΔABC where a = 3.42,  

b = 3.89, and c = 2.95.

3)  Determine the area of ΔABC in problem 13.

4)  If <X = 52°, y =12, and z = 13, calculate the area of

ΔXYZ. Round your answer to one decimal place.

Answer 1

1) use the law of cosines

2) use the law of cosines

4) A=(1/2) ab sin ∠C