What is 27 over 21 in its second sipilest form?

Shayla was late for school she ran the last half mile in 4 minutes what was her average speed in miles per second? What is 25 percent off 120? What is a perfect score on the Mississippi algebra 1 state test? What is 43 rounded to nearest 100? What is heeling over? Why were coins created? How many 12x12 inch pavers for 10x8 foot patio? What is half of 31.7? What is 13 of 49? Which American inventor said Genius is 1 percent inspiration and 99 percent perspiration? How do you read a balance scale? Can you multiply a term and a number for example 3 multiplied by 9x? What is 6.7 rounded to the nearest whole number? How many times can 4 go into 560? What is the percent for 12 of 1144? Were do you use romen numerals? Which best explains how to change 3 5-9 into an improper fraction? What is error prevention? How did ancient roman impact your world today? How much is a zillion?