What is the value of 15 + x2 when the value of x is 3? also there's a tiny 2 above the 15

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

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?