28. Which of the following represents a linear function that is proportional? O A. y = - 5 O B. O C. The total charge, y, for renting a car is $18 plus $0.10 a mile, x. acer

An open top rectangular tank with square bases is to have a volume of 10 cu. m. The materials for its bottom are to cost P 15 per square meter and that for the sides, P6 per square meter. Find the most economical dimensions for the tank. A. B. C. D. 1.5m x 1.5m x 4.4m 2m x 2m x 2.5m 4m x 4m x 0.6m 3m x 3m x 1.1m What is the maximum profit when the profit-versus-production function is as given below? P is profit and x is unit of production. P=200,00-x- A. 285,000 B. 200,000 C. 250,000 1.1 X+1

K a. Find a power function that models the data. b. Find a linear function that models the data. c. Visually determine which function is the better fit for the data. X 1 2 3 5 6 y 5 9 21 32 45 a. The power function is y = (Use integers or decimals for any numbers in the expression. Round to the nearest thousandth as needed.) b. The linear function is y = 0x+0) (Use integers or decimals for any numbers in the expression. Round to the nearest thousandth as needed.) c. Which model is a better fit? OA. The power function is a better fit because the y-values appear to be increasing more rapidly as x increases.

The average water level in a retention pond is 6.8 ft. During a time of drought, the water level decreases at a rate of 3 in./day. a. Write a linear function W that represents the water level W(f) (in ft) t days after a drought begins. b. Evaluate W(20) and interpret the meaning in the context of this problem.