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math formulas
2011 - math formulas
Question | Answer |
---|---|
Percent Proportion | is/of = %/100 |
Percent Of Change Proportion | change/original=%100 |
Sales Tax | original price x tax %(as a decimal)= Tax amt. = original price+ tax |
Tip | 1. original price x tip (as a decimal)= tip amt. 2. total amt. = original price + tip amt. |
Discount | 1. original price x discount %(as a decimal) = discount amt. 2. total amt.= original price- discount amt. |
Simple Interest | interest= principal x rate x time (I =prt) |
Area Of a Rectangle | Area = base x height or length x width |
Area Of a Triangle | Area = (base x height) /2 |
Area of a Trapezoid | Area = height(base 1 + base 2)/2 |
area of a circle | Area = pi x Radius^2 |