What is the correlation coefficient of the line of best fit

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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?

Opposite angles in a parrellelogram are