Different solution

let correctAnswers = 0;
let questionAnswer = [
  ['Capital of Australia','Canberra'],
  ['Number of states in the United States','50'],
  ['How many colors in the rainbow','7']
];

let answerOne = prompt(questionAnswer[0][0]);
let answerTwo = prompt(questionAnswer[1][0]);
let answerThree = prompt(questionAnswer[2][0]);

let userAnswer = [answerOne, answerTwo, answerThree];

for(let i = 0; i <= 2; i+= 1) {
if ( userAnswer [i] === questionAnswer[i][1]) {
  correctAnswers += 1;
}
else {
  correctAnswers = correctAnswers;
}
}

var html = '<p>' + 'You got ' + correctAnswers + ' question(s) right.' + '</p>' 

document.write(html);

function print(message) {
  document.write(message);
}