Two cars start from two towns 400 miles apart and travel towards each other. they pass each other after 4 hours. find the speed of each car if the difference between their speeds is 20 miles per hour.

answear:

a

step-by-step explanation: a

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation: