Grade for Class 7 Assignment

Good job, Mike.

### Study the changes provided

#### Exercise 1

No crashes, but doesn't work as expected. 3 points

The program's output:

```
$ ruby 1_extend_ruby_base_classes.rb
true
true
true
false
false
true
true
true
```

Should be:

```
$ ruby 1_extend_ruby_base_classes.rb
true
true
true
true
true
true
true
true
```

- The `Integer#to_roman` method doesn't work correctly
  - Don't reassign `num` for each iteration of the `each` loop
  - Return the `answer` that's being constructed

#### Exercise 2

- No crashes, works as expected. 4 points
- No newlines between the class definition and first method definition

#### Exercise 3

- No crashes, works as expected. 4 points
- The solution for the `pick` method was over-thought

#### Exercise 4

- No crashes, works as expected. 4 points
- Avoid using an explicit `return` statement for the last expression of a method
- The `self.` receiver is implicit

#### Exercise 5

- No crashes, works as expected. 4 points

#### Total

`3 + 4 + 4 + 4 + 4 = 19` :star: