Algebra Linear and Exponential Review

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

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

• y = 15(35)^x

• y = 15(1.35)^x

• y = 15(0.35)^x

• y = 35(1.15)^x

Which is equivalent to 3^{4 ?}

• 27

• 9

• 81

• 12

In the formula, y=mx+b, what does "b" stand for?

• Starting point

• Growth/ Slope

• A linear line

• "b" is for busted

Some banks charge a fee for a savings account that is left inactive for an extended period of time. The equation y = 5000(0.98)^x represents the amount remaining, y, of one account that was left inactive for a period of x years. What does the number 5000 represent in this situation?

• fee charged for an inactive account

• percent of money in the account after x years

• amount of money in the account initially

• amount of money in the account after x years

The value of a car is $15,000 and depreciates at a rate of 8% per year. What is the decay factor?

• ^.08

• ^1.08

• .92

• 8

Uber charges an initial fee of $2 plus $0.75 per mile. What type of function is this? 

• Linear 

• Exponential 

• Neither 

Is the table linear or exponential?

• Linear

• Exponential

Uber charges an initial fee of $2 plus $0.75 per mile. What is the equation that goes with this situation?

Mathematical Equivalence

ON

What is the equation that matches the function below?
You have $100 and spend $5 every week. 

• y=100^x+5

• y=5x+100

• y= -5x+100

• y = 5^x