Answer:
For the first box, the answer is 3.
For the second box, the answer is -1.
For the third box, the answer is 0.
I hope this helped!
Answer:
cosR = 
Step-by-step explanation:
assuming the right triangle has ∠ Q = 90° with legs 5 and 12
then this is a 5- 12- 13 right triangle with hypotenuse PR = 13 cm
then
cosR =
=
= 
I think its the second one
Answer: use photomath
Step-by-step explanation: