2.7/2.8
1.(a) When a is greater then one the parabola is facing upward and is getting more narrow as the value of a gets larger
(b) When a is between 0 and 1 the parabola is still facing upward but is getting wider as the value of a gets closer to 0
(c) The same for negative but the parabola is facing downward
2. When you change the value of b the parabola shifts up or down along the y-axis