Petunia rides her bike. What does the initial value mean?

Petunia is riding toward her home.
Petunia starts 10 miles from home.
Petunia rides at 5 miles per hour.
It takes Petunia 2 hours to get home.

Petunia more like Tuna..

Tuna Salad more like Petunia Salad

answer: -10

step-by-step explanation:

s(t) = 1 - 10t

s(x) = 1 - 10x

s(x + h) = 1 - 10(x + h)

            = 1 - 10x - 10h

s(x + h) - s(x) = 1 - 10x - 10h - (1 - 10x)

                      = 1 - 10x - 10h - 1 + 10x

                      = -10h

= -10

beth buys 10 x shirts and still has more than 100 in her account