its 14n+21. 7×2n is 14n, and 3×7 is 21
Answer:
Step-by-step explanation:
(x,y) becomes (-y,x) so (3,2) would become (-2,3)
L = 20 inches
w = width
L = length
area = 120
W x L = 120
L - 8 = 2W then L = 2W + 8
substitute for L:
W x (2W + 8) = 120
2W² + 8W -120 = 0
(2W - 12)(W + 10) = 0
2W-12 = 0
2W = 12
W = 6
L = 20