Step-by-step explanation: Isolate the variable by dividing each side by factors that don't contain the variable.
(-7/8)(-3/4)
multiply the numerators together
(-7)(-3)=21
multiply the denominators together
(-8)(-4)=32
answer:
21/32
we have
<u>Pieces of mail delivered in December by the US postal service</u>

<u>Pieces of mail delivered in January by the US postal service</u>

To find the total mail delivered for these two months, sum the two quantities
so

therefore
the correct solution is 
the error is in this part

To move decimal over one place 10 to the power of 10 should be 10 to the power of 11
Answer: -1 and 4
Explanation: the others aren’t because they have variables in one and numbers in the other