Functions and rate of change

Which of these is NOT a function

• A

• B

• C

• D

• y=30x

• y=20x+10

• y=30x+10

• IDK

Consider each of the scenarios below. If initial values were provided for each scenario, which could be modeled by an equation of the form y = ax + b? Select all that apply.

• A savings account, which earns no interest, receives a deposit of $500 per month.

• The value of a car depreciates by 10% every year.

• Every week, 3/5 of a radioactive substance remains from the beginning of the week.

• Every 8 hours, half of a drug dosage remains in the body.

How long will it take to use all 100 sheets of paper?

• 10mins

• 12.5mins

• 15mins

• 19mins

Find the average rate of change(slope) between the following points: (1,12), (3,108)

• 36

• 24

• 72

• 48