2. A coal miner is 140 feet beneath the surface of the earth and ascending at an average rate of 2.1 feet per second. His replacement begins at the surface and
descends at an average rate of 1.8 feet per second. About how long will it be until
the workers are at the height?

your answer is the frist one

hop i

i use my brain for prombles like this maybe you could try it

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:

answer: sherk

step-by-step explanation:

just give up and watch the best anime ever sherk