It is 7
2*2x = 4x + 2 = 30
4x = 28
x = 7
It a negative 1 because when have the - sign it a negative number
If you use the 20% off coupon your total will be $16.80.
+ Purchase Price = $21
- Discount (21 x 20)/100 = $4.20
<span>= Final Price 21 - 4.20 = $16.80
</span>
If you use the $5 dollars off coupon your total will be $16.00.
$21 - $5 = $16.00
The better coupon to use would be the five dollars off coupon because $5 dollars off will be 80 cents less than using the 20% coupon.
If the radius is doubled, volume would increase by 4 times.
202020202020202020202020202020
L+L+(L-4)+(L-4)=72
4L-8=72
4L=80
L= 20
so W= 20-4 or 16
