book Maths Puzzle Numerical Ability

How do you know the angles of hypotenuse and obtuse?

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5-1/2(x-6)=4 I know that x=8,I`m confused on how to break it down HELP! I'm stuck on something that should be easy....."leaft cutter ants that live in Central & South America, weight about 1.5grams on ant can carry a 4 gram peice of leaf that is