When Jeremiah looked at his cell phone bill for the month, he saw that he had spent 2/5 of his minutes talking to his mother and 1/5 of his minutes talking to his best friend. What fraction of the minutes did Jeremiah spend talking to either his mom or his best friend?

that would be 3/5 minutes

Step-by-step explanation:

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:

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24