Help please! I am so lost, what are the steps?

1. How much force does it take to stretch a spring 0.45 m if it has a spring constant of 20 N/m? 2. A force of 30 N is applied to a spring of spring constant 8 N/m. How far will the spring stretch? 3. How much elastic potential energy is stored in a spring that is pulled 0.20 m and has a spring constant of 40 N/m? 4. A spring contains 200 J of elastic potential energy, when stretched 0.4 m. What is the spring constant of the spring? 5. Block "m" starts at the top of the ramp, 0.7 m high. The block has a mass of 2 kg and slides down the ramp, running into a spring and compressing it. The spring has a spring constant of 40 N/m. Answer the following questions. a. What is the gravitational Ug of the block to start? m b. What is the K of the block as it slides across the ground? -I- --X-- c. What is the Us of the spring when it is compressed by the block? d. How much is the spring compressed