Confidence intervals for one population mean when S.D. is unknown /t-curve

For a t-curve with df = 8, find each t-value and illustrate your results graphically.

a.The t-value having area 0.05 to its right.
b.  t 0.10
c.The t-value having area 0.01 to its left
(hint: A t-curve is symmetric about 0.)
d.The two t-values that divide the area under the curve into a middle 0.95 area and two outside 0.025 areas