Question

A school system is reducing the amount of dumpster loads of trash removed each week. In week 5, there were 60 dumpster loads of waste removed. In week 10, there were 40 dumpster loads removed. Assume that the reduction in the amount of waste each week is linear. Write an equation in function form to show the amount of trash removed each week.
A) f(x)=-4x+60
B) f(x)=4x+60
C) f(x)=-4x+80
D) f(x)=4x+80

Answer 1

And since the goal of the school is to reduce the number of dumpsters (cleaned?) then the slope of such a line should be negative.

Answer 2

That eliminates the 2nd and 4th choice.

Answer 3

If we look at a pattern of weeks to dumpsters you'll notice that after 5 weeks the dumpsters went down 20. So if we look at week 0, that means we will know how many dumpsters were at the beginning before the reduction started.

Answer 4

Do you follow?

Answer 5

Think So..

Answer 6

Is the answer D .. ?

Answer 7

No. the school is trying to REDUCE the number of dumpsters. Reduce means subtract or take away.

Answer 8

Ohhhhhhhhh, so then its B

Answer 9

I meant A

Answer 10

im so confused xD

Answer 11

no its not A

Answer 12

So then its C

Answer 13

Thanks! that was really confusing .-.

Answer 14

Why do you say its C?
Just wondering if you got the concept.

Answer 15

Because since their goal is to reduce the number of dumpsters then the slope gotta be negative. and since from 40-60 is 20 then i just added 20 to 60 and got 80

Answer 16

CORRECT!!! Well done.

Answer 17

Thanks for the help!