The point (x, y) lies on the circle with center (8,−4) and radius 9. Which equation must be true? A.
(x−8)2+(y+4)2−−−−−−−−−−−−−−−√=81
B.
(x+8)2+(y−4)2−−−−−−−−−−−−−−−√=81
C.
(x+8)2+(y−4)2−−−−−−−−−−−−−−−√=9
D.
(x−8)2+(y+4)2−−−−−−−−−−−−−−−√=9

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Light travels at 186,000 miles per second. light takes about 1 1? 3 seconds to travel from the earth to the moon. calculate the distance between the earth and the moon based on the speed of light.

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95