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White raven [17]
3 years ago
12

The equation for a circle is ​x^2 − 8x + y^2 - 2y - 8 = 0

Mathematics
1 answer:
Ivanshal [37]3 years ago
6 0

Answer:

B

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

To obtain this form use the method of completing the square

Given

x² - 8x + y² - 2y - 8 = 0 ( add 8 to both sides )

x² - 8x + y² - 2y = 8

add ( half the coefficient of the x/y terms )² to both sides

x² + 2(- 4)x + 16 + y² + 2(- 1)y + 1 = 8 + 16 + 1

(x - 4)² + (y - 1)² = 25 → B

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blsea [12.9K]
That would be 8, its in the center so forget 9 or 7.
6 0
3 years ago
Which number is NOT in the solution set of the inequality x>-15?
Ipatiy [6.2K]

Answer:

d

Step-by-step explanation:

if x has to be greater than -15 and -20 = x than its not true because -20 isn't greater than -15

5 0
3 years ago
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What expression represents '' five times the quotient of some number and ten"? A.5(z/10) B.5(z-10) C.5(10/z) D.5(10-z)
maw [93]

Answer:

Option A is correct

5(\frac{z}{10})

Step-by-step explanation:

Let the number be z.

Given the statement:

'' five times the quotient of some number and ten"

" quotient of some number and ten" translated to \frac{z}{10}

"five times the quotient of some number and ten" translated to 5 \times \frac{z}{10}

Then, the expression we get,

5(\frac{z}{10})

Therefore, 5(\frac{z}{10}) expression represents '' five times the quotient of some number and ten"

5 0
3 years ago
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When solving negative -1/3.(x − 15) = −4, what is the correct sequence of operations
rodikova [14]
Distribute through the parenthesis
subtract 5 from both sides
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6 0
3 years ago
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Over 44% of the 30 students in a class read a book last month. What are the possible numbers of students in the class who read a
AlladinOne [14]

Answer:

75

Step-by-step explanation:

30÷40%=75

8 0
3 years ago
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