Step-by-step explanation:
All has been answered... send me any questions at comments
The 3 option
(3,9), (-7,1), (6,12), (-3, -9)
Area = length x width
180 = L x 15
L = 180/15
Length = 12 feet
If you are going to use mental math, round $0.98 up to $1.
Rounded, the cost of the 30 songs is $30.
However, since you rounded at the beginning, you need to subtract 2 cents for every song you purchased from the total of $30.
Multiply 30 by $0.02 to get $0.60. Subtract $0.60 from $30.
Your answer should be $29.40.