A problem states that Ursula earns $9 per hour. To write an expression that tells how much money Ursula earns for h hours, Joshua wrote 9/h Sara wrote 9h. Whose expressions is crrect and whu

Here, h represents the hours.

As per the statement:

Ursula earns $9 per hour.

In 1 hour Ursula earns = $9

then;

in h hours Ursula earn = 9h

Therefore, an expression which tells that 9h money Ursula earns for h hours.

Sarah expression 9h is correct.

Because it tells how much money she earns each hours.