If f(x)=x+2 and g(x)=3x+4, then f(g(x))=?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.

Me d is also an option but i couldn't get it in the picture

What expression is equivalent to (84+16)