Problem #1. <span>c. (-1/2,-5/2),(2,5)
#3 x^2 -18x +81 = 19+81 (18/2)^2
(x-9)^2 = 100
x-9 = + or - square root of 100
x= 9 + or - 10
x= 19 and -1
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Area= pi x r^2
Pi = 3.14
Radius= 13^2
3.14 x 169 = 530.66
7. because you would put the number set into order from least to greatest first, ti would look like this: 2,3,4,5,9,10,12,12. then go to the middle, crossing one from each side off at one time. Then you get 5 and 9 in the middle. Then the middle between 5 and 9 is seven, you can check this by: 5+9=14, then 14/2= 7.
Your median is 7.
Answer:
This is very TRUE. They are more prone to electromagnetic interference.