NEED HELP!!!!!!!!

Mathematics

2 answers:

suter [353]3 years ago

7 0

Um..since it twelve times at many bars then you do 54*12 which equals 648. 594 more

WARRIOR [948]3 years ago

6 0

If Mrs. Candy's class sold 54 and mrs. rights class sold 12 times as much then that would be 54 × 12 which equals 648. So mrs. right sold 684. then to find out how much more they sold you do 648 - 54 which equals 594. So Mrs. right sold 684. And she sold 594 more than Mrs. Candy

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21. The equation x² + y² - 6x + 8y = 74 represents circle C. What is the radius of circle C?

marin [14]

Answer:

The radius is $3\sqrt{11}$ .

Step-by-step explanation:

The standard equation for a circle is $(x-h)^2+(y-k)^2=r^2$ .

I like to call this form center-radius form because it tells you the center (h,k) and the radius r.

So we put it in this form to determine r, the radius, which is the desired value here.

We will need to complete the square.

Thankfully there is a formula to take more thinking out of the process:

$x^2+dx+(\frac{d}{2})^2=(x+\frac{d}{2})^2$ .

Let's begin:

$x^2+y^2-6x+8y=74$

Reorganize the equation so the x's are together and the y's are together.

$x^2-6x+y^2+8y=74$

Now time to being completing the square. Keep in mind whatever you add to one side you need to add the other side to keep the equation equivalent to what it once was.

$x^2-6x+(\frac{-6}{2})^2+y^2+8y+(\frac{8}{2})^2=74+(\frac{-6}{2})^2+(\frac{8}{2})^2$