There are 500 middle school students. 60% of them ride their bikes or walk to school each day. How many middle school students ride their bikes or walk to school each day? A. 450
B. 300
C. 400
D. 220

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?