Ursula earns $9 per hour. to write an expression that tells how much money ursula earns for h hours, josh wrote 9\h. sarah wrote 9h. whose expression is correct and why

The important information's already given in the question can be used to find the correct answer.
In 1 hour Ursula earns = 9 dollars
So
In h hours Ursula earns = (9/1) * h dollars
                                       = 9 * h hours
                                       = 9h hours
So we have found from the above discussion that Sarah wrote the correct answer and it was 9h. I hope you are satisfi3ed with the answer and the explanation that I have provided. You can use this procedure for solving similar problems.

10x(8+9)
or
10x17

hope this helps