Which situation is best modeled by the equation 9 plus x equal 16?
a. you have $16 left after spending $19 and some other amount.
b. the price of a water bottle, $9, was decreased by some amount of $16.
c. nine friends each pay the same amount to get into a theme park, and the total is $16.
d. you pay nine dollars for a burger and some amount for dessert for a total of $16.

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: