$46.20 on 12 gallons of gas ,what is the price per gallon

What are the domain and range of the function f(x)=2^x+1

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.

Will give brainliestbased on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m?