1.  Consider a square with side of length a, and an an isosceles right triangle with one side of length a and hypotenuse of length b. What is the sum of the areas of the square and the triangle? 

Hint
Halfnhalf Clue
 

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

3.  A gas cylinder has two vents, V1 and V2, for discharge. The cylinder empties in 7 minutes when only vent V1 is open. The cylinder empties in 5 minutes when both vent V1 and vent V2 are open. About how many minutes will the cylinder take to empty if only vent V2 is open? 
 Halfnhalf Clue
 

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