Exponential Functions

Exponential Functions 1

100

Determine if the function shows growth or decay?

y=3(4)^x

Growth

200

what is the formula for exponential functions? 

A)y=mx+b

B)b/2a

C)change of y/change of x 

D) y=ab^x

D) y=ab^x

300

If you have a starting value of 5 and it doubles what is the equation? 

A) 3(5)^x

B)5(2)^x

C)2(5)^x

D)5(3)^x 

B)5(2)^x

400

What is b from the exponential function?

y=34(23)^x

b=23

500

What is the y-value of the function when x = -2?

y=3(2)^x

y=3/4 

Exponential Functions 2

100

Identify the a (y-intercept) from the equation.

y=2(5)^x

a=2

200

the a in y=ab^x is the starting value

True or False 

True 

300

Which one is an exponential function

Function A) 

x:0,1,2,3 

y:2,4,6,8

Function B)

x:0,1,2,3

y:3,9,27,81 

function B

400

the line on an exponential graph is a straight line.

true or false 

false exponential graphs have curved lines 

500

which word helps you find if the percent is going down in the equation

A)increases 

B) decay 

C) growth

D) rise 

B)decay 

Exponential Functions 3

100

which definition is correct for rate of growth

A)as the x value increases the y value decreases 

B) as the x value increases the y value increases 

B) as the x value increases the y value increases 

200

what does b represent in y=ab^x 

A)starting value 

B) the exponent 

C) the rate of growth/decay 

C) rate of growth and decay

300

simplify the equation 400(1+.4)

A)480 

B)600

C)560

D)440

C) 560 

400

the a in y=ab^x acts as the y-intercept

Yes or no 

yes because the a acts as the starting value ot the y intercept in the equation 

500

the house is worth 9,000 dollars and the price doubles every year. What is the equation? 

A) y=9,000(2)^x

B) y=9,000(1.2)^x

C) y=9,000(2) 

D) y=2(9,000)^x

A) y=9,000(2)^x

Exponential Functions 4

100

Is this an exponential function? Yes or No.

y=3x+3 

No it is linear

200

what does the x represent in y=ab^x

A)rate of growth and decay 

B)starting value/y intercept 

C)the exponent

C) the exponent 

300

which function is multiplying by 3

Function A)

x:0,1,2,3

y:2,6,18,54

Function B)

x:0,1,2,3

y:1/3,1,3,9

C) all of the above 

c) all of the above 

400

If the starting value is 6 and it triples what is the equation?

A) 4(6)^x

B) 6(3)^x

C) 2(6)^x

D) none of the above 

B) 6(3)^x

500

Which function has a greater rate of growth?

Function A) y=2(1/4)^x

Function B) y=2(2/3)^x

Function B