Find \displaystyle\lim_{x\to -4}\dfrac{7x+28}{x^2+x-12} x→−4 lim x 2 +x−12 7x+28 limit, start subscript, x, \to, minus, 4, end subscript, start fraction, 7, x, plus, 28, divided by, x, squared, plus, x, minus, 12, end fraction.

step-by-step explanation:

i don't know i don't know

-5/3

step-by-step explanation:

when a line is perpendicular to another line, it's slope is the negative reciprocal of the original line. the slope of the line given is 3/5 so the slope of the line perpendicular to this one is -5/3 : )