Exponential Growth and Decay-Writing

A tennis tournament begins with 128 players. At the end of round one, there will be 64 players. There are 32 players at the end of round 2 and 16 players remaining at the end of round 3. Which equation best models this situation?

• y = -64x + 128

• y = 0.5x + 128

• y = 128(0.5)^x

• y = 128(2)^x

Given this table of values, construct the function that represents the sequence.

• y = 3(4)^x

• y = 3x + 4

• y = 4(3)^x

• y = 4x + 3

Which equation describes the equation below?

You have $5 and triple your money everyday.

• y = 5^x

• y = 15^x

• y = 5(3)^x

• y = 5(3x)

Write the equation of the exponential function for the given graph.

• y = 4(1)^x

• y = 0.25(1)^x

• y = 1(0.25)^x

• y = 1(4)^x

Write the equation for the exponential function in the given graph.

• y = 0.5(2)^x

• y = 2(0.5)^x

• y = 0.5x + 2

• y = 2x + 0.5

If f(x) = 2x - 9, what is f(3)?

• 6

• 3

• -3

• -6

In an exponential function, what does "a" represent? Check all that apply.

• Slope

• y-intercept

• initial amount

• starting value

Write the equation of the exponential function for the given table.

• y = 2(1/3)^x

• y = 1/3(2)^x

• y = -2(1/3)^x

• y = -2(-1/3)^x

What would go in the top box?

• 3/4

• 7

• 12

• 1

What would go in the bottom box?

• 3/4

• 7

• 12

• 1