The bacteria in an old piece of cheese is growing at a rate that can be modeled by y = 280 • 2x. Determine which number represents the growth rate.

Y = 280 • 2x

You have to Isolate the variable

y = 280 • 2 x

y = 280 • 2 x/2

isolate X by dividing by 2

Y = 280 • x

Now, divide 280 / 2. You do this because the answer needs to be the sam eon both sides.

280 / 2 is 140.

X = 140