Tommy works as an electrician. He charges $40.00 flat fee a service call and $32.50 for each hour of labor. Tommy was paid $170.00 for his last job. How many hours did Tommy work on his last job?

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?

How do i put 3(x+7) in distributive property

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point