Hi Mia! How much air is inside the bubble is the same as asking for the volume of a bubble. A bubble is a sphere, and the volume of a sphere is found by V=(4πr^3)/3, where r is the radius. So

Place value usually says which number it refers to. In the 690, the 1s place value is 0, the 10s place value is 9 and the hundreds place value is 6. Another example would be with the number 527.

hello, I am not sure if I understand your question correct. However, if you are asking why percentage is per 100 and not per 1000 or 10, the response is - it is per 100 because that is what the mathematicians

Hello Tom, These days, with the Internet, it is easy to get many digits of pi with great reliability. For example: http://www.factmonster.com/ipka/A0876705.html http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits

Hi Aishwarya, Direct and inverse variation are not the same as cross multiplying. They are concepts used in problem solving. Direct variation is when the independent variable increases proportionally

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