Answer:

Step-by-step explanation:
1st you want to find a common denominator. which is 8.
2nd change
to 
3rd you add
and
together an you get 
2xy + 5 - 8 + 3xy - y +7 + 3y = 5xy - 8 + 2y + 12
Answer:
He should buy a 50 inch TV
Step-by-step explanation:
Using Pythagorean theorem the TV cabinet has a diagonal of :

When grades are expressed as a quantity of 1, such as two feet per second or 5 miles per hour, they are called unit rates.