Estimate the area under the graph of y=(1/x) for x between 1 and 32 by dividing the interval [1,32] into 31 equal subintervals and using the left endpoint of each subinterval as sample point. Next, estimate the area using the right endpoint as sample point. Find the difference between the two estimates (left endpoint estimate minus right endpoint estimate).

What does it mean as equal subintervals?

Question

Estimate the area under the graph of y=(1/x) for x between 1 and 32 by dividing the interval [1,32] into 31 equal subintervals and using the left endpoint of each subinterval as sample point. Next, estimate the area using the right endpoint as sample point. Find the difference between the two estimates (left endpoint estimate minus right endpoint estimate). 

What does it mean as equal subintervals?