Answer:
$ 12.09
Step-by-step explanation:
formula Y = KX
Where; y = $ 24.18
x = 2 books
k = constant of proportionality
Step 1. Do the equation based on the formula
Y = kx
$24.18 = k2
Step 2. Divide by 2
$24.18/2 = k2/2
k = $12.09 (answer)
This is the Commutative Property of addition. called Commutative because the numbers move around to the other order, or "commute"
The answer would be 720 because you times all sides length times width times height