It is real urgent, and I need your help. PLZ

Answer : h = 10.5$
Explanation: since it says the total amount is 30$ then
The equation should all add up to 30$
And with the h= 10.5$
When we plug h in the equation we get:

30 = 15 + 2(10.5-3)
30 = 15 + 2(7.5)
30 = 15 + 15
30 = 30