Which fraction is not in simplest form? explain.
: 9/21 , 7/18, 3/25, 12/31

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

How can you construct perpendicular lines and prove theorems about perpendicular lines

To decrease an amount by 16% what single multiplier would you use