the length of the Amazon River in South America is about 4,000 mi. How many feet is this?
1 mile = 5,280 feet
4,000 * 5,280 = ?
where did you get 5,280 from
I learned it when I was in elementary school.
http://www.google.com/#hl=en&sugexp=cqn%2Ccconf%3D0.95%2Cmin_length%3D2&gs_nf=1&pq=feet%20mile&cp=10&gs_id=36&xhr=t&q=+mile+feet&pf=p&sclient=psy-ab&oq=+mile+feet&aq=0&aqi=h1g4&aql=f&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=af73696fe4de10c7&biw=711&bih=453
To convert miles to feet, we need to know the conversion factor.
1 mile is equal to 5,280 feet.
So, to find the length of the Amazon River in feet, we can multiply the length in miles by the conversion factor:
4,000 miles * 5,280 feet/mile = 21,120,000 feet
Therefore, the length of the Amazon River in South America is approximately 21,120,000 feet.