f(x)=5x^2+9x−4

g(x)=−8x^2−3x−4

find (f+g)(x)

my options :
a. 3x^2+6x−8
b. −3x^3+6x^2−8x
c. −3x^4+6x^2−8
d. −3x^2+6x−8

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0

Heather is a cashier. she can ring up 1212 customers in 99 minutes. at this rate, how many minutes does it take her to ring up 44 customers?