Please answer ASAP

1. which example below represents exponential growth?
A the cost of a meal if each slice of pizza is $2
B the radioactive decay of material C the value of a car over time
D the rapid spread of a disease

2. which example below represents exponential decay?
A the balance on your city bus pass if you ride the bus twice a day everyday
B the number of smartphone users in the past 5 years
C the number of cancer cells overtime with treatment
D rapid spread of a disease

3. which table is an example of exponential growth? (Refer to photo)
a. fun island
B. great island
C mystery island

4. How can you determine if a table is a linear function or an exponential function?