Amplitude : 2/3
Period : 3pi/2
The bike shop made $28 dollars profit. First, you add the cost of the bike and the cost of the helmet, which is $84. Then you divide that by 150 to get what 1% would be, which is .56. Then you multiply that by 50%, which is the part of the price that the shop profited, which is $28.
3 months, i just answered this same question lol.
F^-1(x) is the inverse so...
f^-1(x) = (-1/5)x - 11/5
