How do I enter math symbols in an exercise?

While some exercises have a special keypad from which you can choose a math symbol, there are a limited number of symbols available in it. In some cases, there is no special keypad, and it may not be obvious how you should type a math symbol.

Here's the breakdown on how to enter some common math symbols:

Multiplication  

Use an asterisk (*, Shift + 8 on an American keyboard). For example, 3 times 4 is "3*4."

Division

Use a slash (/) for division. For example, three-fourths are entered as "3/4."

If you have any operations in the numerator or denominator, surround this with parentheses. For example, 12 divided by 5n would be entered as "12/(5n)," and the quantity of n plus 3, all divided by 6, would be entered as "(n+3)/6."

Square root

Type SQRT. For example, to enter the square root of 3, type "sqrt(3)."

(For cube roots and other non-square roots, see Fractional exponents.)

Pi

For the number approximately equal to 3.14159..., type "pi."

Theta

It's the eighth letter in the Greek alphabet, it looks like a 0 with a horizontal line in the center (θ). Type "theta."

Powers or exponents

Use a caret (^).  For example, to enter 4 to the 5th power, type "4^5."

Fractional exponents

Use a caret (^) and type the fraction in parentheses.  For example, to enter the cube root of x or x to the 1/3 power type "x^(1/3)."

Greater than or equal to

Type ">=."

Less than or equal to

Type "<=."

Logarithms

For base 10 logarithms, enter "log(x)" where x is the number. For natural logarithms enter "ln(x)."

Logarithms with bases other than 10

You should be able to enter your answer as "log_b(n)", where b is the base and n is the number.