A plumber charges a $25 service fee plus $39.50 per hour to work on plumbing in a house. Which equation represents the
total cost, C, for the plumber's service if he works h hours?
A.)C = 39.50 + 25h
B.)h= 39.50C + 25
C.)C = 64.50h
D.)C = 25 + 39.50h
Plz help m!

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?