U=x²+xy+y²+1/x +1/y Check the following function for extremum(Math analysis).

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x