Explain each part !
the cost c, in dollars , of building a concrete sidewalk varies directly with its lentgh , s, in meters
a.. find an equation relating c and s if 200m sidewalk costs $4500
b) what does the constant variation represent ?
c) use the equation to determine the cost of a 700m sidewalk

b

step-by-step explanation:

if a was wrong then it has to be b it cant be c either because not all the y intercepts are the same!

ok now , i would like brainlest plz

why do wages differ across industries

step-by-step explanation :

micro economists are concerned with economics on an industry or individual firm basis.

macro economists are concerned with national and international level