Exponential Functions Prequiz

In an exponential function, what does the 'a' represent?

• Input

• Rate of change

• Y-intercept/Initial value

• Output

In an exponential function, what does the 'b' represent?

• Input

• Rate of change

• Y-intercept

• Output

• 
• 
• 
• 

What is the y-intercept of the function?

• 2
• 3
• 1
• -2

What is the starting amount in the problem below?

f(t) = 300(1.05)^t

• 300

• 1.05

• t

• y

What is the initial value in y=4(2)^x

• 4

• 2

• x

If the functions is growing at a rate of 3%, the b value is _____.

If the functions is growing at a rate of 2.7%, the b value is _______.

A new savings account is opened with $400 and gains 3% every year. What is the exponential function?

• f(x)=400(.97)^x
• f(x)=400(1-0.03)^x
• f(x)=400(1.03)^x
• f(x)=400(0.03)^x

There were 417 cell phones sold at an electronics store in January. Since then, cell phone sales at this store have increased at a rate of 3.75% per month. At this rate of growth, which function can be used to determine the monthly cell phone sales x months after January?

• f(x) = 417(3.75)^x
• f(x) = 417(0.0375)^x
• f(x) = 417(1.0375)^x
• f(x) = 417(1.375)^x