To 'round numbers' you need to go into mode and select what float you want i.e. if you want to round a number to 2 decimals select 'float 2'
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There are a number of good online resources for using a graphing calculator. These include Bright Storm, Math Bits, Dummies and GrafCalcWhiz amongst others.
Awnser = Start paying attention in class.
The answers varies by calculator. However, most calculators capable of calculating exponents (such as scientific or graphing calculators) have a button with the symbol^. You can use that button to calculate exponents like this: a^x, where a and x are numbers. For example: 2^2 = 4. And 3^3 = 27.
Without using a graphing calculator the possible answer is: length = 40 metres and width = 20 metres because: Area = 40*20 = 800 square metres Perimeter = 40+40+20+20 = 120 metres
To do calculations using complex numbers.