## Precalculus: Mathematics for Calculus, 7th Edition

$(A)$ negative $(B)$ positive $(C)$ positive $(D)$ negative
$a \gt0$ meaning it is positive meaning $a = +$ $b \lt0$ meaning it is positive meaning $b = -$ $c \lt0$ meaning it is positive meaning $c = -$ $(A) -(+) = -$ $(B) (-)(-) = +$ $(C) (+) - (-) = +$ $(D) (+)(-) + (+)(-) = -$