In def, sin d = 24/25. what is cos e?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Need solving this second acceleration problem.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.