Do i use sin cos or tan to solve this problem

There is a spinner with 14 equal areas, numbered 1 through 14. if the spinner is spun one time, what is the probability that the result is a multiple of 2 or a multiple of 5?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?