As the toy car rolls away, it slows down. Why?

Friction

Explanation:

Depending on the material the toy car rolls away on, the more friction is created, the more friction there is, the more on surface rubs against another, creating friction, slowing it down

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

i think so it’s will be b yes i believe its