need some help figuring out some simple stats, ive been given the mean and standard deviation for 2 different samples and im having trouble finding the degrees of freedom and critical value in order to do a 2 sample T interval test

Sample A

n=15

SD=5

mean=42

Sample B

n=15

SD=2

mean=44

how do i find the degrees of freedom and critical value? my book says "use technology to find..." but i cant seem to figure it out

thanks!