I NEED HELP with PLATO, Investigation of Simple Harmonic Motion I attached the questions in the order in which they are asked except for Part F

Part F
Find the times (to the nearest hundredth of a second) that the weight is halfway to its maximum negative position over the interval . Solve algebraically, and show your work and final answer in the response box. Hint: Use the amplitude to determine what y(t) must be when the weight is halfway to its maximum negative position. Graph the equation and explain how it confirms your solution(s).