$10.50 for 3 pounds I need to know

Find the solutions for a triangle with a =16, c =12, and b = 63º

What is the 12th term of b(n)=-4-2(n-1)

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10