Amarble is drawn from a jar containing red, blue, and white marbles. p (red) 0.40 and p (blue) 0.25. what is p (white)

25.35. Here's what you do, if those numbers are multiplied by a 100, they'd be40% red, and 25% blue. So the white is the rest. So you add 25%+40%=100%; 
35%. Divide by 100, .35. Boom! you got your answer;)

Rounding decimals is very similar to rounding other numbers. if the hundredths and thousandths places of a decimal is forty-nine or less, they are dropped and the tenths place does not change. for example, rounding 0.843 to the nearest tenth would give 0.8. , your welcome !

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