Katie has equation
and wants to solve it completing the perfect square. In order to do it, first rewrite 7 in right side:

Then note that
so Katie has to add
to both sides (because
):

Answer: correct choice is C.
Answer:
Step-by-step explanation:
Yes this answer is reasonable since 47 divided by 11 is close to 4. The answer is 4 2/71
Answer:

Step-by-step explanation:
because you are finding the total they both had in September, you add. 12 + 9 = 21