An olympic sprinter runs 200 meters in 20.1 seconds. calculate the runner's speed in miles per hour.

Since their speed is 200meters/20.1seconds, we can try to multiply it out to get our answer. Using the identity property (we can multiply expressions by 1), we have 1 mile = 1609.34 meters, so we can multiply our expression by 1mile/1609.34meters (not we have the mile on the top to cross out the meters), ending up with 200*1mile/(20.1seconds*1609.34). To convert seconds into hours, we know that there are 3600 seconds in an hour, so we multiply it by 3600 seconds/1 hour (seconds on the top to cross out the seconds on the bottom), resulting in
200*3600*1mile/(20.1*1609.34*1 hour)= 22.25812788 miles/hour

It is based on the reddish glow of the morning or evening sky, caused by haze or clouds related to storms in the region.

Technically speaking, histograms are another version of bar charts, if you need to work one out then skim through google hope-o that -o!