1. Problem 18: Manny pays $7.95 per month for 12 months. Find the total payment for the year. Formula: Total payment $x = ext{monthly payment} \times ext{number of months}$ Calculation: $$x = 7.95 \times 12$$ $$x = 95.4$$ So, Manny paid 95.4 in full for the year. 2. Problem 19: Vera's car depreciated by 2300 after one year and is now worth 28140. Find the original value $x$. Formula: Original value $x = ext{current value} + ext{depreciation}$ Calculation: $$x = 28140 + 2300$$ $$x = 30440$$ So, the car was worth 30440 when purchased in 2016. 3. Problem 20: A 12-inch candle burns at 0.4 inches per hour. Find how many hours it takes to burn completely. Formula: Time $t = \frac{\text{length}}{\text{burn rate}}$ Calculation: $$t = \frac{12}{0.4}$$ $$t = 30$$ So, it will take 30 hours for the candle to burn completely.