please help with 18 and 19 :)

.Question 18 0/1 pt @ Details Use the information in the following table to find h (a) at the given value for a. 4 8 (a) O N 00 60 N 10 m F h (x) = f (g (x)); a =0 h (0 ) : Question Help: 9 VIDEO Message instructor D Post to forum Question 19 0/1 pt @ Details A mass hanging from a vertical spring is in simple harmonic motion as given by the following position function, where t is measured in seconds and s is in inches: s (t) = -6cos (it + # ) Round answers to 2 decimal places. a. Determine the position of the spring at t = 3.5 s. s (3.5) = b. Find the velocity of the spring att = 3.5 s. v (3.5) = in. /s