exam Maths Puzzle Numerical Ability

If angle A and angle B are acute angles of right triangle ABC, what is the value of sin A - cos B ?

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exam Other Question

Here is my question. A train travels non-stop for 24 hours at a speed of 70 miles per hour. How far does it travel in that time?

Thanks a lot.
Jass Solve: 3^(x^2+4x) = 1/27