Answer:
A. the Commutative Property
Step-by-step explanation:
D doesn't exist
C is wrong and so is B.
First make the denominators of the fractions the same by multiplying.

×

=

Now we just need to add the fractions together

=

9/6 would be the answer, but it can be simplified further, then converted into decimal form.

÷

=
=1.5 yardsYour final answer is 1.5 yards of ribbon are needed.
Answer:
12 is missing
Step-by-step explanation:
Answer:
+10 or -10
Step-by-step explanation:
square root both sides