PLEASE HELP WITH THIS QUESTION ASAP Sketch y > xy (I know how to sketch the inequalities when there is 2 variables bit not like this)

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

Multiply the polynomials (x+3)(x^2-6x+5)