Associate
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How far have you gotten so far? Have you calculated your interval?
ΔX = (b - a)/n
As Dis86 said, it's pretty much a case of substitution. Long winded but pretty simple - first YouTube result:
https://www.youtube.com/watch?v=ns3k-Lz7qWU
See how far you get with that.
I missed all the classes when this was discussed, due to illness.