Clarissa's sister makes weekly installment payments for a motorized scooter she purchased from a friend. she purchased the motorized scooter for $600 and is paying $18.75 a week to her friend until it is paid off. clarissa's sister wants to know when she has $150 left to pay for the motorized scooter. select the equation and solution for the number of months, x, it takes her to have $150 left to pay.