I need to write this as an algebraic expression: During a drought a reservoir drops 3 in. ea. week for x straight weeks. Express the overall change in water level as an algebraic expression... Please and thank you!
I thought it would be -3n or -3(N) BUT MY PROF. TOOK HALF A POINT AWAY!
ok, then it's just 3x, if you want an equation:
Let C be the change in the water level after x weeks
then, C = 3x
so after, say, 3 weeks, the change in the water level is 9 inches, since the water level will drop 9 inches over this period of time, which is what plugging in 3 into our formula yields