Part A : The expression is 24h + 25 =
H = hours
So you substitute 3 hours
24(3)+25
72+25 = 97
So it's $97 dollars for 3 hours with 1 house call.
Part B : My evaluation is correct because h represents hours. Since she worked for 3 hours and get 24$ each hour. You times 24 by 3 which gives you 72 and you add 25 for the house call that you got.