Given the function f(x) = x2 and k = –1, which of the following represents a function opening downward?

a. f(x) + k
b. kf(x)
c. f(x + k)
d. f(kx)

Equation for the calculation double 2 and then add 5

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation,and the determine the cost if he drove it70 miles.b) what would be the cost of a car rental if the car was driven 250 miles? show work