help me with 2 questions? thank you

Draw your triangle ....    calculate hypotenuse via pythagorean theorem

 

hypotenuse =  4 sqrt 5

 

csc b =  1/sin b    =   1/ (opp/hyp) =  hyp/opp =  (4 sqrt5)/8 = sqrt5 / 2  

    Now you try the rest......

 

Tan A = opp/adj =

 

cos B = adj/hyp =  

 

 

 

I think you have the second one correct !!