Answer:
Step-by-step explanation:

Combine like terms. 1/4 and 7/8 are like terms and LCD of 4 and 8 is 8
9/10y and -3/5y are like terms and LCD of 10 , 5 is 10

Answer: I have included an image of the correct answer.
They are skew lines
Answer:
first you add all the sides up and then subtract the perimeter with all the added up sides u will get ur answer
16 divided by 2=8 and 4 times 2= 8