The standard equation of the circle is:
(x-h)^2+(y-k)^2=r^2 where (h,k) it the center of the circle and r is the radius...
so
30.
(x-2)^2+(y-7)^2=16
31.
We need to find the radius...(I'll just use the Pythagorean Theorem)
r^2=6^2+8^2
r^2=36+64
r^2=100 (so the radius is 10) and its center is (-6,-8) so
(x+6)^2+(y+8)^2=100
Answer:
20！
Step-by-step explanation:
Answer:
* 
= 
= 1
Step-by-step explanation:
Number of pieces of chalk that are yellow is 6
<h3><u>Solution:</u></h3>
Given that there are 18 pieces of chalk
To find: number of pieces of chalk that are yellow
Given that, ratio of chalk that is yellow to chalk that is not yellow is 1 : 2
Therefore,
chalk that is yellow : chalk that is not yellow = 1 : 2
Let the chalk that is yellow be 1x
Let the chalk that is not yellow be 2x
Also, total pieces of chalk = 18
That is,
chalk that is yellow + chalk that is not yellow = 18
1x + 2x = 18
3x = 18
x = 6
number of pieces of chalk that are yellow = 1x = 1(6) = 6
Thus 6 chalk pieces are yellow
