Answer:
C
Step-by-step explanation:
substitute the given values for j and k into the expression

= 
= 
= 10
I think the first one is 2y and the secound is,
That would be 8. To see the answer, we reverse the operations- 20-16=4. 4 x 2 = 8.
Answer:
B
Step-by-step explanation:
sinA=opp/hyp
sinA=16/20=4/5
cosA=adj/hyp
cosA=12/20=3/5