HELP!!
1. Which example below represents exponential growth?
a. The cost of a meal if each slice is $2.
b. Radioactive decay of materials.
c. The value of a car over time.
d. 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 every day.
b. The number of smart phone users in the last five years.
c. Number of cancer cells over time with treatment.
d. rapid spread of disease.

3. Which table is an example of exponential growth? (SEE PICTURE)
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?

1.

Choice A is not exponential growth or decay because the cost will go up by the same amount ($2) each time. Choices B and C are exponential, but they aren't growth functions. Rather, they are decay functions. A disease spreads exponentially because one person infects two, and then each of those two people infect two others (making 4 additional people infected), and so on.

2.

Assuming the treatment works and it is effective, then the cancer cells will go away over time. One example would be that the population is cut in half each time. Choice A is not an answer because the balance will go down the same amount each time. This is assuming the bus company does not change its prices. Choices B and D are eliminated because they represent growth.

3.

I'm unable to answer this because the table is missing.

4.

If the y values increase or decrease by the same amount, as x increases by some set amount, then you have a linear function. For example, if x increases by 1 pairs up with y increasing by 4, then the slope is 4/1 = 4 and we have a linear function.

On the other hand, if x increases by 1 couples with the y values multiplying by some set amount, then you have an exponential function.

Example:

Each time x increases by 1, y is multiplied by 5.

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.