Inheritance
### 9.1
* Add a class NumericQuestion to the question hierarchy of Section 9.1.
If the response and the expected answer differ by no more than 0.01, then accept the response as correct.
* Due: May 16, 2019
Inheritance
### 9.1
* Add a class NumericQuestion to the question hierarchy of Section 9.1.
If the response and the expected answer differ by no more than 0.01, then accept the response as correct.
* Due: May 16, 2019