Rob's Refrigerator Repair uses the equation y = 39.50x + 75 to calculate the total charge, y, in dollars, for x hours of work. What is the meaning of the slope of the equation?
O A The charge for each hour is $75.00.
B. The base fee for service is $75.00
OC. The base fee for service is $39.50.
D. The charge for each hour is $39.50.

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)