Find the t value(s) for each of the following cases.
a. Upper tail area of .025 with 12 degrees of freedom
b. Lower tail area of .05 with 50 degrees of freedom
c. Upper tail area of .01 with 30 degrees of freedom
d. Where 90% of the area falls between these two t values with 25 degrees of freedom
e. Where 95% of the area falls between these two t values with 45 degrees of freedom