Please help with questions 9-10 and what option they would be

Question 9 1 pts A 0.50 kg mass that is attached to an ideal spring with a spring constant of 7 N/m undergoes simple harmonic oscillations with an amplitude of 3.10 cm. What is the total mechanical energy of the system? 1.2 x 105 J 6.2 x 103 J 3.5 x 10-1 J 1.8 x 10-3 J Question 10 1 pts A transverse wave delivers constant power to a rectangular section of material. If the power delivered is 45 mW, then how much energy is delivered to the material over a 30 second period? 1.35 J. O 4.55 J O 0.60 J O 2.75 J