<span>7 - 9 = 2
9 - 11 = 2
You should see that the series just increases by +2
therefore you can figure out what the last four terms are and then add them up one of the last terms given is 21</span>
Answer:
4 treats per dog.
Step-by-step explanation:
Find the rate that she keeps for one dog. As it gives you the rate for 3 dogs, simply divide 3:
(3 dogs/12 treats)/(3/3) = (1 dog/4 treats).
Carol keeps 4 treats for every dog she has.
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Answer:

Step-by-step explanation:
Given

--- first discount
--- second discount

Required
Determine the amount paid
First, we add the total discount:



If she got a discount of 40%, then she paid 60% (i.e. 100% - 40%)
So:


Calculate the sales tax




your answer option is option 3.
6 and 7