In a pile of coins worth $21.25, there are 15 more quarters than loonies. How many quarters are there?

What is the inverse of the function f(x)=2x+1

Miranda is braiding her hair.then she will attach beads to the braid.she wants 1_3 of the beads to be red.if the greatest number of beads that will fit on the braid is 12,what other fractions could represent the part of the beads that are red?

Ineed with math stuff it involves graphs