Which of the following sets of ordered pairs is a function? O {(5,6), (-2,3), (10, 1), (-2,-9)}
O {(2,5), (-1,9), (6,3), (-1,-2)]
O {(1,3), (-2, 4), (4,5), (3.-2)]
O {(3,4), (2, 3), (3,-2), (4,1)]

C

Step-by-step explanation:

in order to be a function, the x value cannot repeat itself. C is the only one where x value doesn't repeat.

hope this !

step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)