Linear vs Exponential Word Problem

Jenny went to the sale at Kohl's last weekend.  
T-shirts were on sale for $15 each and hoodies were on sale for $20 each.  If she spent $150 total, write an equation to represent this situation.  

• 20x + 15 = y 

• 35x = y 

• 15x + 20y = 150 

• 150 - 20x = 15y 

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

• Linear 

• Exponential 

• Neither 

The iPhone X is valued at $1000 upon purchase. The value is expected to decrease by 14% each year. What type of function is this? 

• Linear 

• Exponential 

• Neither 

The population of Cary, NC in the year 2000 was 97,400 people. The population steadily grew by 2.5% each year. What type of function is this?

• Linear 

• Exponential 

• Neither

What type of function describes the story below?
You have $10 and earn $5 every week. 

• Linear

• Exponential

• Neither

Julie gets a pre-paid cell phone. Initially she has a $40.00 balance on the phone. Each minute of talking costs $0.15. Linear or exponential?

• y=40x+.15

• y=40-.15x

• y=40(1.015)^x

• y=40+.15x

• y=40(.15)^x

Read the word problem below and determine which function is a correct representation.

A machine salesperson earns a base salary of $40,000 plus a commission of $300 for every machine he sells. What type of equation shows the total amount of income the salesperson earns, if he sells x machines in a year.

• Linear

• Quadratic

• Exponential

A man is climbing down from 100 feet high descending 30 feet per minute.

• y = - 30x + 100

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

A newly launched clothing line is rapidly increasing in popularity. Every month, 20% more items of clothing are sold. If 89,090 items were sold this month, how many will be sold in 9 months from now? If necessary, round your answer to nearest whole number.

• 74,278 items.

• 11,957 items.

• 319,226 items.

• 459,685 items.

A(n) _________________ function will ADD the same number each time.

• Linear

• Exponential

• Neither