Rewrite as:
4y=x^2-12x+68
divide by four:
y= x^2/4-3x+17
your answer would be
(6,8)
It is 10 and a half.
You add 7/2 three times to make it around the United States so then that would be 21/2. Then u simplify it and get 10 and half!
Plug in 8 for the y. First do the right side because PEMDAS teaches us to do exponents before multiplying. 8*8=64. Now, do the left side. 8*1/2 is the same as 8/2=4. Now add: 64+4=68. 68 is your answer :)
The function representing the price of the ring x years after 2000 is f(x) = (100 + 35)/100 *x + 590 = 135/100 *x + 590 = 1.35x + 590
i.e. f(x) = 1.35x + 590