exam Maths Puzzle Numerical Ability

-77+ (-71)=

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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 My daughter started prealgebra yesterday and the answer to her question
10 x n = 8 Is n = 0.8 but how do I explain to her how i got it.