A store offers a discount of 10% to customers who spend more than $20.00. If a customer’s bill is $80.00, how much will he actually pay?

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

What is r i 4.5+10r=-6.5 with work pls

The coordinates of vortex a’ are (8,4) (-4,2) (4,-,4) the coordinates of vortex b’ are (6,6)(12,-,12)(12,12) the coordinates of vortex c’ are(-2,,12)(4,12)(12,-4)