What doexs this equal: 3ab-9ab+7ab

I think that it equals 1ab. Because 3ab - 9ab= -6ab + 7ab= 1ab

So, this question tests wether or not you know how to combing "like terms".

Like terms are terms (thing inbetween +or-) that have the same variables.

Since all three terms contain "ab" we can add and subtract them.

So, 3ab-9ab = -6ab

-6ab+7ab=1ab

1ab is the correct answers

a.) list the factors of 40.

1/2/4/5/8/10/20/40

b.) list the factors of 40 that represent the number of cans that could be on each shelf.

5

c.) how many different arrangements of cans are possible?

just one because if you put more on one shelf you will go way over 40 and the cabinet will probably break.

d.) what are the possible arrangements of the cans?

put 5 cans on each self to reach 40 cans in total.

e.) which arrangement uses all the shelves?

5 because you can put 5 cans on each shelf, and since there are 8 shelfs you are equally going to get 40 cans.

c.

step-by-step explanation: