exam Maths Puzzle Numerical Ability

Farmer John stores grain in a large silo located at the edge of his farm. The cylinder-shaped silo has one flat, rectangular face that rests against the side of his barn. The heigh

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Bob made an investment- some at 6% and three times as much at 10%. If his total annual investment income was 5400 dollars, how much did he invest at each rate? Please help!
If we establish an identity, (in simplest terms)4 sec^2 A - 7 tan^2 A would equal what?
Thank you, Tami