Answer:
b
Step-by-step explanation:
A is irrational but b is rational. This is because for b you can work out both square root of 64 (8) and square root of 4 (2). But for a, the square root of 5 is an irrational number :)
Answer:
10.2 gallons
Step-by-step explanation:
Luke buys $14.35 worth of gasoline for his car
The gas station sells at $1.409 per liter
Therefore the number of gallons that luke buys can be calculated as follows
= 14.35/1.409
= 10.2 gallons
The original area of a face would be a^2. Now that you added b to the edge, the new area of each face would be (a+b)^2. To find how much the are increased, subtract a^2 from (a+b)^2. 
So the answer is b(2a+b)
