To solve A, complete the square for both variables.
The center is (6,4)
Answer:
9% fund: $
210,000
13% fund: $70,000
Step-by-step explanation:
As she wants to have a $28,000 annual return for her $280,000 investment, she is expecting a return rate of 10%:

If we call x the proportion of the capital in the 9% fund, then (1-x) is the proportion of the capital in the 13% fund,and the return of the combination has to be the expected return of 10%:

Then, we know that 75% of the capital should be invested in the 9% fund and 25% in the 13% fund.
This correspond to a capital of:
9% fund: 0.75*$280,000 = $
210,000
13% fund: 0.25*$280,000 = $70,000
-15 both sides and then it’s will be
5x = 13 then u divide both sides over 5 and the answer will be ( X=2.6 )
Answer:
So options 1,2,3,6 are rational numbers.
Step-by-step explanation:
1). In this option the given number is √100×√100 =10×10=100
Which is a rational number.
2) 13.5+√81 = 13.5 + 9 = 
Its a rational number
3) √9+√729 =3+ 27 =30
It is a whole number which is the form of rational number.
4) √64+√353 = 8 + 18.788924( an irrational Number) =26.79
So addition of any number to an irrational number is always irrational number.
5)
= 1/3 + 14.6969( an irrational number)
When we add any number to an irrational number it's sum is always irrational number.
6) 
Again addition of two rational number giving a fraction.So it is a rational number
So options 1,2,3,6 are rational numbers.