Question

Suppose Marie starts out with $1820 and spends $80 each week. If x represents the number of weeks since the beginning, write the function that shows the amount in her account.

Answer 1

The function representing amount in her account after 'x' week is
`f(x) =1820-80x` .

Explanation:

Given:

Amount in the beginning =$1820

Amount spend each week = $80

We need to find the amount in her account after x weeks.

Solution:

Let the number of weeks be 'x'.

Let f(x) be the Amount in her account.

Now Amount in the account will be equal Amount in the beginning minus Amount spend each week multiplied my number of weeks.

framing in equation form we get;

`f(x) =1820-80x`

Hence The function representing amount in her account after 'x' week is
`f(x) =1820-80x` .