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The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Light travels at 186,000 miles per second. light takes about 1 1? 3 seconds to travel from the earth to the moon. calculate the distance between the earth and the moon based on the speed of light.