Petra deposited $278.16 in a savings account that earns 2.1% simple interest. what is petra’s account balance after nine years?

The answer is $330.73.

Step 1. Calculate simple interest: I = ?
Step 2. To get account balance add simple interest to the principal amount:
I + P = ?

Step 1. Calculate simple interest.
I = P * r * t
P - principal
r - rate
t - time period

We have:
P = $278.16
r = 2.1% = 2.1/100 = 0.021
t = 9

I = 278.16 * 0.021 * 9 = 52.57

Step 2. To get account balance add simple interest to the principal amount:
I + P = ?
52.57 + 278.16 = 330.73

  see below

Step-by-step explanation:

An exponential term with a base greater than 1 will increase at an increasing rate. If the base is less than 1 (a fraction), then it will decrease at a decreasing rate.

Any (non-zero) base to the 0 power will have a value of 1, so the function will have a y-intercept at (0, 1) if there is no multiplier (vertical scale factor) of the exponential factor. The y-intercept will be the value of the multiplier.

__

y-intercept at (0,1)

graph initially decreases rapidly and then decreases slowly

__

y-intercept at (0,5)

graph initially decreases rapidly and then decreases slowly

__

y-intercept at (0,1)

graph initially increases slowly and then increases rapidly