HOW many feet of hero for 50 people?

Why is it you cannot divide a number by zero? Why work done on the system is negativeand it is positive when its done by the system? What is greater minus three quarters or minus one and three quarters giving reasons why? A person writes letters to six friends and addresses the corresponding envelopes In how many ways can the letters be placed in the envelopes so that at least two of them are in wrong envelopes? How many 3 digit numbers have at least one repeated digit? How do you write thirty eight and ninety seven hundredths kilograms? What divided by what equals sixteen and two thirds? How do you figure the radius of a circle? What is shorter 3Cm or 20MM? Is nonagon greek or latin? Why is the bible in the world book of records? How many ways are there to select 3 cards one after the other from a deck of 52 cards if the cards are not returned to the deck after being selected? How many sevenths are there in 6 8/7? What is 25percent 45? What is 7x6000? How are corresponding angles of two similar figures related? What is the value of a 2000 penny with a w mark on the side? The area of a square is 0.5 hectare Its diagonal equals? What is 6 out of 16 as a percent? What lab objects do you use to measure volume?