Answer:
I have zero clue what the hell this is supposed to be
Step-by-step explanation:
The period of a sinusoid

is

, so any range such that

will give two complete periods.
Since both is equal to p(a), you can set them as equal to each other:
15 = 2a - 3
18 = 2a
9 = a
Answer:
47.1cm
Step-by-step explanation: