145% of what number is 21

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Based on the figures as marked, /\rqs = —

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?