Write a program that checks whether an expression with various parentheses symbols are balanced. An expression has balanced parentheses if each opening symbol has a corresponding closing symbol and the pairs of parentheses are properly nested.

What is stored in str after the following code executes? string str = "computer science"; int i = 0; while (i < 8) { if (str. indexof("m") < i) { str = str. substring(0, 2) + str; } i += 2; } computer science cocomputer science cococomputer science cocococomputer science computer scienceco

Why should characters such as / \ " ' * ; - ? [ ] ( ) ~ ! $ { } < > # @ & | space, tab, and newline be avoided in file names?

What is the total resistance in a circuit that contains three 60 ohm resistors connected in a series? a. 20 ohms b. 120 ohms c. 60 ohms d. 180 ohms