Eleven is decreased by twice a number. represent this statement using a mathematical expression.
0 11x-2
2x+11
11 - 2x
o 2x-11

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?