Equation for a circle
r^2 = (x - h)^2 + (y - k)^2
where r = sqrt[ (-2 - (-10))^2 + (-5 - (-20))^2]
sqrt[ (8)^2 + (15)^2 ]
sqrt[ 64 + 225 ]
= sqrt[289] = 17
equation for a circle
17^2 = (x - (-2))^2 + (y - (-5))^2
17^2 = (x + 2)^2 + (y + 5)^2
Answer:
Step-by-step explanation:
Group like terms 6y-2y= 2-1-2
When a number goes over the equal sign= positive + changes to negative, vice versa.
So final answer is 4y= -1= -4y
Because 4 is decided by -1
Answer:
5 students.
Step-by-step explanation:
25% is a quarter of the amount, or 1/4. A quarter of 20 is 5, since 4 times 5 is 20. So 5 students have cats.