91,007,500 in scientific notation with positive powers of 10

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

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

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?