Help plzz will mark brainlist

What is the slope of a line that is perpendicular to y = 3x + 1

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|