help with area under the curve using right end point

.Approximate the area under the curve on the given interval using rectangles and right-endpoint evaluation. Round to three decimal places.
y-x^(3)-1 on [1,4], n=100
a)58.704
b)70.381
c)63.000
d)61.698

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2. Approximate the area under the curve on the given interval using rectangles and right-endpoint evaluation. Round to three decimal places.

y=x^(2)-8 on , [0,2], n=16

a)-14.078
b)-0.817
c)-13.578
d)-13.078

anyone?

You might want to wait more than 21 minutes before bumping. Also, in the meantime, you might want to post what you have done so far, so we can see where you are stuck.

given the large values of n, I doubt that you were meant to complete this without using technology ...

Riemann Sum -- from Wolfram MathWorld