If x^2-y^2 = 56 and x-y= 4 then what is the average of x and y
a) 3 b) 7 c) 2 d) 6 e) 4

7

Step-by-step explanation:

is a difference of squares.

When factoring a difference of squares, you can use this formula .

So can be factored as .

So back to the problem:

Rewriting with a factored left hand side:

We are given x-y=4 so rewriting again with this substitution:

Dividing both sides by 4:

So we have x+y equals 14.

We are asked to find the average of x and y which is (x+y)/2.

So since x+y=14 , then (x+y)/2=14/2=7.

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation:

but there’s no any figure there!