exam Maths Puzzle Numerical Ability

A map has a scale of 1 centimeter : 8 kilometers. Use the given actual distance on the map.

4 km

Any help with this equation would be Greatly</b> appreciated.No answers from Solver 91311 please:)

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exam Other Question

write an equation for the hyperbola:
vertices (-7,0) and (7,0), conjugate axis of length 10. A simple random sample is to be drawn from a population of 1200, in order to have 90%confidence that the sampling error in estimating "n"is no more the 0.03, what sample size will be necessary?

P.S. I just ca not get this one and I have tryed.