The average age of three people running for election is 42. A fourth person joins the race and the average drops to 40. What is the fourth person's age?
OA. 32
OB. 34
ОО
C. 35
D. 36
E. 40

B. 34

yep

step-by-step explanation:

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.