Math Expressions: eliminating ambiguity

Question 1

calculatedNum = 2 + (2 * 6);

What is the value of calculatedNum?

Answer 1

14

Question 2

calculatedNum = (2 + 2) * 6;

What is the value of calculatedNum?

Answer 2

24

Question 3

calculatedNum = (2 + 2) * (4 + 2);

What is the value of calculatedNum?

Answer 3

24

Question 4

calculatedNum = ((2 + 2) * 4) + 2;

What is the value of calculatedNum?

Answer 4

18

Question 5

Write a statement that assigns to num the result of 10 + 2 * 4, clarified with parentheses, producing 18. The variable hasn’t been declared beforehand.

Answer 5

var num = 10 + (2 * 4);

Question 6

Write a statement that assigns to cost the result of 2 + 2 * 4 + 10, clarified with parentheses, producing 56. The variable hasn’t been declared beforehand.

Answer 6

var cost = (2 + 2) * (4 + 10);

Question 7

Write a statement that assigns to units the result of 2 + 2 * 4 + 10, clarified with parentheses, producing 20. The variable hasn’t been declared beforehand

Answer 7

var units = 2 + (2 * 4) + 10;

Question 8

Write a statement that assigns to pressure the result of 4 / 2 * 4, clarified with parentheses, producing .5. The variable hasn’t been declared beforehand.

Answer 8

var pressure = 4 / (2 * 4);

Question 9

Write a statement that assigns to pressure the result of 4 / 2 * 4, clarified with parentheses, producing 8. The variable hasn’t been declared beforehand.

Answer 9

var pressure = (4 / 2) * 4;

Question 10

Write a statement that assigns to a variable the result of adding two variables together and then afterward multiplying the result of the addition by another variable. The first variable has been declared beforehand.

Answer 10

cost = (foodCost + laborCost) * multiplier;

Question 11

Write a statement that assigns to a variable the result of 4 / 2 * 4 - 1, clarified with parentheses, producing -.5. The variable hasn’t been declared beforehand.

Answer 11

var x = (4 / (2 * 4)) - 1;
or
var x = 4 / (2 * 4) - 1;