Answer:
Step-by-step explanation:
let the length of rectangle=l units
width=9
p=2(l+9)
area=9l
9l=2(l+9)
9l=2l+18
7l=18
l=18/7 units
20 and 40
20 doubled is 40
The difference is 20
Hope this helps! :)
4x = 3x + 10
x = 10
4(10) = 40
3(10) + 10 = 40
