HELP!

f+s= total # of trips

x+y= amount of cement they bring when they each go one trip

xf + sy = total number of concrete they bring after all their trips

$x$ = cubic yards of cement the first truck can hold at one time

$y$ = cubic yards of cement the second truck can hold at one time

$f$ = number of trips of the first truck

$s$ = number of trips of the second truck

$f+s$ = the combined number of trips between the first and second trucks

$x+y$ = the combined cubic yards of cement that can be held between the first and second trucks

$xf+sy$ = the combined cubic yards of cement delivered between the first and second trucks

bmichelle9, are you a naturally rude idiot, or have you received special training?

Put the question back so others can learn from it.