What is the height of a cuboid

The radius is 10cm
Surface area = 900 pie

Find the balance at the end of 4 years if 1000 is deposited at the rate of

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

What is the value of x? enter your answer in the box.