Ineed with #28.. asap i have to get it done

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Which math sentence can be used to determine if the triangle is a right triangle?

Which function is odd check all that apply a. y=sin x b. y=csc x c. y=cot x d. y=sec x