Which relation is a function?

a. {(-2,10), (-6,10), (-2,3)}

b. {(5,5), (5,9), (5,15)}

c. {(0,3), (0,9), (12,-4)}

d. {(-5,1), (4,9), (6,10)}

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Which of the following is the correct ratio for converting kilograms to grams

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1