Answer:
Option C. exponential decay function
Step-by-step explanation:
In this problem we have a exponential function of the form

where
y ---> is the money that is in the bank
x ----> number of days
a ---> is the initial value or y-intercept
b is the base of the exponential function
r ---> is the rate of change
b=(1+r)
In this problem we have that
Each day 1/2 of the money that is in bank value is removed
so
---> is negative because is a decreasing function
The value of b is equal to


The value of b is less than 1
b<1
That means -----> Is a exponential decay function
Anser is B). Subtract smallest number
A. you would put in 7 for X and 3 for Y.
3 + 7 = 10
2(10) = 20
<span><span>8x</span>+<span>10y</span></span>=<span>9
Hope this helps.</span>
I would rather use a ruler but it depends on what you are doing.