4z is greater than or less than -12 answer

How do you find the area of a triangle

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'