1647. 1 hour=60 minutes. John can mow 247 square feet per minute, so he can mow 60*247=14820 square feet per hour. 1 yard=3 feet, so 1 square yard =3^2=9 square feet, so in the same duration of time, John can mow 14820/9=1647 square yards (approximately) per hour.
14.1 is terminating because others number are repeat forever
The difference of two squares. The number which, when multiplied together three times yields the original number.
She is totally a bad writer