What is the place value of 9 in the number 3.0492?

If the simple interest on a sum of money invested at 3% per annum for 2\(\frac{1}{2}\) years is N123, find the principal.

A machine valued at N20,000 depreciates by 10% every year. What will be the value of the machine at the end of two years?

If 2x + y = 10, and y \(\neq\) 0, which of the following is not a possible value of x?

If x + y = 12 and 3x - y = 20, find the value of 2x - y