Answer:
The answer is y is 0.05.
Step-by-step explanation:
At cos(2x) and the left and right boundaries are at 400 pm.
At 0 pm = cos(2π × x ÷ ∧) = 1
So,
A has to be 0.075.
it looks like at 300 pm, y = 0.05.
0.05 = 0.075 × cos(2π × 300 pm ÷ ∧)
= 0.05.