Answer:
Well, this could turn out to be a simple permutation problem: you have ten number choices (0-9) for each digit of a phone number and repetitions are allowed. Technically, there could be as many as \begin{align*}10^{10} = 10,000,000,000\end{align*}, or 10 billion possible phone numbers.
Step-by-step explanation:
:D
Least Common Denominator of 10 and 15 is 30.So 30 might be the denominator.Hope this helped.
1.Jose drove for 6 hours before Rob caught him.
<span>2. 21 hrs for the round trip</span>