Given: f(x) = 5x-10, what is f(9)?

Anyone know? will mark brainliest if you're correct!

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work

Aski resort is charging $37.50 to rent a snowmobile for 5 hours. at this rate what will be the cost for a family of 5 to rent snowmobiles for 3 hours on the first day of their vacation and 4 hours for on the last day of their vacation