Question 112537
A) AREA=5*7=35 IN^2
PERIMETER=2*5+2*7=10+14=24 INCHES.
B) AREA=15*21=315 IN^2.
PERIMETER=2*15+2*21=30+42=72 INCHES.
C) INCREASE IN AREA=315-35=280 IN^2. 
OR (280-35)/35=7 OR 700% INCREASE IN AREA.