F(n) = 900 - 60(n-1) represent the amount oscar still need to repay on a loan at the beginning of month n .find the amount oscar pays monthly and the month in which he will make his last payment.

Each installment will be of 60 and 16th will be the last payment.

Step-by-step explanation:

To find the monthly repayment by Oscar we first find the sequence.

For that first we put in

Now for

For

So the sequenxe is 900,840,780......

As the amount is decreasing by 900-840=840-780=60

Therefore each installment will be equal to 60

For last payment amount will become 0

i.e.

Last month will be 16th

Equation: or

Solution:

Step-by-step explanation:

The formula that is used to calculate the perimeter of  a square is:

Where "s" is the side lenght the square.

Knowing that Xin used  20 yards of fencing to build the walls of a square chicken coop (in which the lenght in yards of each wall is represented with "x"), you can identify that:

Then, you can susbtitute values into the formula :

Finally, you must solve for "x" in order to find its value.

This is: