A 150-pound person uses 5.1 calories per minute when walking at a speed of 4 mph. How long must a person walk at this speed A person must walk for at least minutes in order to use at least 150 calories.
(Round up to the nearest minute.)

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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?