book Maths Puzzle Numerical Ability

A 12 foot ladder is leaning against a wall. If the ladder reaches 8 feet high on the wall, what is the angle the ladder forms with the ground to the nearest degree?

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Perform the indicated operation and express your answer in simplest form:

(4/x)-(3x+3/x^2+1x)+(x/x+1) Can you please help me solve this: The volume of a cube is a funtion of the length of a side of the cube. Write a function for the volume of a cube. Find the volume of a cube with a side 13.5cm long.