Simple HArmonic Oscillators Physics?

A simple harmonic oscillator consists of a block of m 1.30 kg attached to a spring of spring constant 310 N/m. When t = 1.20 s, the position and velocity of the block are x = 0.156 m and v = 4.490 m/s. (a) What is the amplitude of the oscillations? What were the (b) position and (c) velocity of the block at t = 0 s?