How many subjective functions are there from {1,2,3,4} to {1,2,3}

What classification best describes 5x+10y+15z=60 2x+4y+6z=60 x+2y+3z=60

Quickly! linda had an orange ribbon and a blue ribbon.the orange ribbon was 2 meters long.the blue ribbon was 4/5 as long as the orange ribbon.linda cut off a piece of blue ribbon. the length of the piece was 25% of the length of the blue ribbon. a) what was the length of the blue ribbon before it was cut. b) find the length of the piece of blue ribbon that linda cut off.

If f(x)=x+4/x, g(x)=x-2 and h(x)=4x-1 what is f(h(g(