Can someone plspls help me with the middle one tysm if you do i rlly need the help!!!:)).

Which equation can be used to solve for the unknown number? seven less than a number is thirteen. n-7=13 7-n=13 n+7=13 n+13=7

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)