Answer: this was all i knew how to do, hope it helps:)
Answer:
-21/10
Step-by-step explanation:
-2/5 - 4/5 = -6/5 <--
a common denominator
Then...
-6/5 -9/10 = -21/10
There is not a common denominator so you have to multiply 2 to the -6/5 to make it -12/10
The answer can be left as an improper fraction which is -21/10
or a mixed number -2 1/10 th
Answer:

Step-by-step explanation:
The Exponential Product rule tells us that...

Therefore,
.
Therefore, 
Step-by-step explanation:
lois need to sell 504 pies to get this amount.
Answer:
F ) √ 9/64
Step-by-step explanation:
√ 9/64 simplifies into 3/8, which is a rational number