+
(Addition)

(Subtraction)
*
(Multiplication)
/
(Division)
^
(Exponent: "raised to the power")
sqrt (Square Root) (Example: sqrt(9) )
More Math Symbols Tutorial Read the full tutorial to learn how to graph equations and check your algebra homework.
HINT: For any problem with weighted averages , you can multiply each value by the weight in the numerator, and then divide by the sum of all the weights that you’ve used. For example, if you had test 1 (say, an 89) counting 20% of your grade, test 2 (say, an 80) counting 40% of your grade, and test 3 (say, a 78) counting 40% of your grade, you will take the weighted average as in the formula below. Don’t forget to turn percentages into decimals and make sure that all the percentages that you use (the “weights”) add up to 100 (all the decimals you use as weights should add up to 1). So when using decimals, your denominator should be 1:
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