Hi
I'm wondering if anyone can help me with t distribtuion questions. I don't know how to solve the questions below. If anyone can help it would be greatly appreciated. Thanks.

Find t such that P(T>t)=0.9 with 23 df
Find t such that P(T<t)=0.25 with 19 df
Find the prob P(T>2.6) with 15 df
Find the prob P(<-1.4) with 24 df