What is the critical value t' for constructing a 95% confidence interval for a mean with 8 degrees of freedom?

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Ineed me i stuck and i don’t want to get it wrong