Aregular octagon has side length 10.9 in. the perimeter of the octagon is 87.2 in cm and the area is 392.4 in2. a second octagon has side lengths equal to 21.8 in. find the area of the second octagon. round to the nearest hundredth.

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Ihave trouble finding the nth term of a linear sequence