Which models can be used to solve the problem

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?