She has to buy $100.00 worth of groceries before her savings equals the membership fee.
Answer:

Step-by-step explanation:
we know that
The linear equation in slope intercept form is equal to

where
m is the slope or unit rate of the linear equation
b is the y-intercept or initial value
In this problem we have
The slope is equal to

The y-intercept is equal to

so
substitute the given values

(Btw, there are tons of online graphing calculators that you can use for free)
The answer you are looking for is the number 12:)
I think it is the first one! When you plug in -7 as ^an, it follows the sequence #1.
Example: a1 = 7 an = 2 + an
you would do this:
first term = 7, second = 7+2 = 9, third = 9+2 = 11, ..........
Get it?