exam Maths Puzzle Numerical Ability

a diagram shows a flagpole standing on level ground. Two cables,R and S, are attached to the pole at a point 16 feet above the ground. The combined length of the two cables is 50 f

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11-51. Refer to the Real Estate data, which reports information on the homes sold in Denver,
Colorado, last year.
a. At the .05 significance level, can we -77+ (-71)=