Answer:
Sorry I really don't know :(
Step-by-step explanation:
Very sorry
The general equation that represents the circle is x² + y² + 8x - 18y + 72 = 0
<h3>How to determine the circle equation?</h3>
The center of the circle is given as:
Center, (a,b) = (-4,9)
The diameter is given as:
d = 10
Calculate the radius (r)
r = 10/2 = 5
The circle equation is then calculated using:
(x - a)² + (y - b)² = r²
So, we have:
(x + 4)² + (y - 9)² = 5²
Expand
x² + 8x + 16 + y² - 18y + 81 = 25
Collect like terms
x² + y² + 8x - 18y + 16 + 81 - 25 = 0
Evaluate
x² + y² + 8x - 18y + 72 = 0
Hence, the general equation that represents the circle is x² + y² + 8x - 18y + 72 = 0
Read more about circle equations at:
brainly.com/question/1559324
Answer:
2
Step-by-step explanation:
a(2,1) means the item of 2nd row and 1st column.
Column is seen vertically and row is seen horizontally.
3 7/10 + 5 4/10 = 8 11/10 = 9 1/10
so estimate = 9
actual answer = 9 1/10
yes, his answer is reasonable
