I can't figure out why this code in my APCS multiple choice book returns 19

SELECT  supplier_id, MAX(Price) AS Price
FROM    lms_book_details
GROUP BY supplier_id

SELECT  bd.book_code,
        bd.book_title,
        sd.supplier_name,
        bd.price
FROM    lms_book_details AS bd
        JOIN lms_suppliers_details AS sd 
            ON sd.supplier_id = bd.supplier_id;

SELECT  bd.book_code,
        bd.book_title,
        sd.supplier_name,
        bd.price
FROM    lms_book_details AS bd
        JOIN lms_suppliers_details AS sd 
            ON sd.supplier_id = bd.supplier_id
        JOIN
        (   SELECT  supplier_id, MAX(Price) AS Price
            FROM    lms_book_details
            GROUP BY supplier_id
        ) AS MaxPrice
            ON MaxPrice.supplier_id = bd.supplier_id
            AND MaxPrice.Price = bd.Price;

BOOK_CODE   BOOK_TITLE                  SUPPLIER_NAME       PRICE
BL0000002   Java The compete reference  ROSE BOOK STORE     750
BL0000006   Java The compete reference  ROSE BOOK STORE     750
BL0000004   Java The compete reference  SINGAPORE SHOPPEE   750
BL0000009   Fire                        KAVARI STORE        999

SELECT B.BOOK_CODE, B.TITLE
FROM BOOK B
JOIN WROTE W
ON W.BOOK_CODE = B.BOOK_CODE
AND W.AUTHOR_NUM ='20'
JOIN INVENTORY I
on I.BOOK_CODE = B.BOOK_CODE
AND I.BRANCH_NUM ='2'

while(True):
    print "Enter Choice"
    print "1).Correct"
    print "2).Incorrect"
    print "3).Incorrect"
    choice = raw_input()
    if(choice == '1'):
        print "That's Correct"
        break
    else:
        print "Please Try Again"

import 'package:flutter/material.dart';

void main() => runApp(new MaterialApp(
      home: new MainPage(),
      debugShowCheckedModeBanner: false,
    ));

class MainPage extends StatefulWidget {
  @override
  _MainPageState createState() => new _MainPageState();
}

class _MainPageState extends State<MainPage> {
  Questions currentQuestion;

  Quiz quiz = new Quiz([
    new Questions(
        "Color of the snow is ", ["yellow", "white", "grey"], "white"),
  ]);
  String questionText;
  int questionNumber;
  String isCorrect;
  List<String> listAnswers;

  @override
  void initState() {
    super.initState();
    currentQuestion = quiz.nextQuestion;
    questionText = currentQuestion.question;
    questionNumber = quiz.questionNumber;
    listAnswers = quiz.answers;
    isCorrect = quiz.correctAnswer;
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Quiz'),
      ),
      body: new InkWell(
        child: Center(
          child: new Column(
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: new Text(
                  questionText,
                  maxLines: questionNumber,
                  style: new TextStyle(fontSize: 20.0),
                ),
              ),
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: buildAnswerButtons(0),
              ),
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: new Text(
                  quiz._questions[0].correctAnswer,
                  style: new TextStyle(fontSize: 20.0),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget buildAnswerButtons(int questionPos) {
    List<Widget> buttons = [];
    for (String answer in quiz._questions[questionPos].answers) {
      buttons.add(
        new RaisedButton(
          child: new Text(answer),
          onPressed: () {},
        ),
      );
    }
    return new Row(
      mainAxisSize: MainAxisSize.min,
      children: buttons,
    );
  }
}

class Quiz {
  List<Questions> _questions;
  int _currentQuestionIndex = -1;
  int _point = 0;
  List<String> _answers;
  String _correctAnswer;

  Quiz(this._questions) {
    _questions.shuffle();
  }

  List<Questions> get questions => _questions;

  List get answers => _answers;

  String get correctAnswer => _correctAnswer;

  int get length => _questions.length;

  int get questionNumber => _currentQuestionIndex + 1;

  int get point => _point;

  Questions get nextQuestion {
    _currentQuestionIndex++;
    if (_currentQuestionIndex >= length) return null;
    return _questions[_currentQuestionIndex];
  }
}

class Questions {
  final String question;
  final List<String> answers;
  final String correctAnswer;

  Questions(this.question, this.answers, this.correctAnswer);
}

var result = 1;

for (let count = 0; count < exponent; count++) {}

result *= base;

result = result * base;

return result;

console.log(power(2, 10));