Determine the t critical value(s) that will capture the desired t-curve area in each of the following

Question:

Determine the t critical value(s) that will capture the desired t-curve area in each of the following cases:
a. Central area = .95, df = 10
b. Central area = .95, df = 20
c. Central area = .99, df = 20
d. Central area = .99, df = 50
e. Upper-tail area = .01, df = 25
f. Lower-tail area = .025, df = 5