Answer:
x-9 = 9 x-9 = -9
Step-by-step explanation:
(x - 9)^2 = 81
Take the square root of both sides
sqrt((x - 9)^2) = ±sqrt(81)
x-9 = ±9
x-9 = 9 x-9 = -9
.5 miles in 1/6 hour
multiply both by 6
3 miles in 1 hour
3 miles per hour
You can do cross multiplication to get,

then just divide by 25 to get,
Divide the number of dollars by the number of slices.
($5.25)/(3 slices) = $1.75/slice