Certain schools of economic thought suggest that a would reduce pollution in a , when compared to command-and-control regulation. a. marketable permit; less cost-effective way
b. pollution tax; flexible, more cost-effective way
c. marketable permit; less flexible manner
d. pollution tax; less cost effective, but flexible way

24 years, i believe is the correct answer.

x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )

it is d i just took the test