Regina's average balance checking account pays simple interest of 3.6% annually, and she made $2.31 in interest last month. what was regina's average balance last month?
a. $770.00
b. $77.00
c. $7.70
d. $7700.00

A. $770.00

Step-by-step explanation:

We have been given that Regina's average balance checking account pays simple interest of 3.6% annually, and she made $2.31 in interest last month.

We will use simple interest formula to solve our given problem.

, where,

,

,

,

Let us convert our given interest rate in decimal form.

Now we will divide 0.036 by 12 to find the monthly interest rate.

Therefore, option A is the correct choice.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

5

step-by-step explanation: