Lawrence's parents pay him a base allowance of $20 per week and $3.55 per hour for extra chores he completes. mrs. johnson pays lawrence $7.15 per hour to lifeguard at the city pool. which equation models lawrence's total weekly income? a. i = 7.15x ? 3.55y ? 20 c. i = (3.55 + 7.15)x + 20 b. i = (3.55 + 20)x + 7.15y d. i = 3.55x + 7.15y + 20