What springs restoring force is opposite stretch direction

Question

Assignment:

1. You put a 45.8 gram mass on a spring, set it in motion with a small amplitude, and count 19 cycles. Those 19 cycles took 3.18 seconds.

What is k_SHM?

2. Use Hooke's Law for this (F = - k s ): Where F is the spring's restoring force; k is the spring constant; and s is the stretch. The negative sign means the spring's restoring force is opposite the stretch direction.

You have a plot from weight [N] versus stretch [m]. The data forms a linear trend y = 3.565 * x + 1.58. How much will the spring stretch if 45.8 grams is hung on the spring?