George invested some money at 12% interest. George also invested 113 more than 4 times that amount at 8%. How much is invested at each rate if George receives $664.20 in interest after one year?

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:

the height of the surface increases from the center out to the sides of the road

it is c!