1.  If x + y = 18 and 2 x  y = 3, then x  y is equal to 

Hint
Halfnhalf Clue
 

2.  After work, Mr. White drove 27 miles west, then 15 miles south, and finally 9 miles west to meet his sister. What is the shortest distance in miles from Mr. White's workplace to his sister's home? 
 Halfnhalf Clue
 

3.  Mr. Haqim drove from Hat Hill to Capsville in 105 minutes at an average speed of 40 miles per hour. In about how many minutes should he make the return journey so that his average speed for the entire journey is 55 miles per hour? 
 Halfnhalf Clue
 

4.  If a and b are both odd numbers, then which of the following must be an odd number ? 
 Halfnhalf Clue
 
