The slope was found using the points (6.4, 117) and (6.6, 120). What is the value of b in the equation of the trend line?

y = 15x + b

Ineed to know the answer right now! !

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?

Combine the information in the problem and the chart using the average balance method to solve the problem.