1) A ball is shot straight up in the air at the velocity of 42ft/sec. Assuming the air resistance can be ignored, how high does it go?

2) f"(x) = -4sin(2x), f ' (0)= -4, f(0) = -6

Find f(pi/5)?

For this problem I keep getting sin2x- 4x -6, then solving: I'm not sure what I'm doing wrong, can you show me step by step for this one? Thanks.