<span>The first step you need to do is to rewrite
x+y=3
as y=3-x
</span><span>Now we can replace the y in the equation with our newfound value for y, which is
y=3-x.
So lets write it now like this
Q=x^2+2(3-y)^2
=x^2+18-12x+2x^2
=3x^2+18-12x
</span>Hope this helps
If n is rational, it means that

Therefore when we do n² we can write it as

Remember that the product of two integer numbers is also an integer, therefore we can guarantee that

Then we can confirm that n² is the quotient of two integers and the denominator is not zero, therefore, n² is always rational, it cannot be an irrational number
I think the expression that you need is, 4-(2x). Hope it helps!
We know here 147 out of 156 customers are not won so far
Probability of not winning=147/156
P not wining=0.94
so probability for winning is 1-P not wining
1-0.94= 0.057
if u want an answer is numerator and denominator so u just find 1-147/156<span />