(a) An important achievement in the history of track running occurred on May 6, 1954, when an Englishman, Roger Bannister, became the first person to run a mile in less than 4 minutes. What is the average speed of a person who runs one mile in exactly 4 minutes in miles per hour?

d

step-by-step explanation:

you'll just earn points here

step-by-step explanation:

35-60 students are taking math.

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation: