exam Maths Puzzle Numerical Ability

THE PERIMETER OF A RECTANGLE IS 96. THE LENGTH OF THE RECTANGLE IS SIX LESS THAN TWICE THE WIDTH. FIND THE DIMENSIONS OF THE RECTANGLE.

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exam Other Question

If F(x)= 3X to the 3rd power -6X to the 2nd power - x + 7, what is the value of f(2) + f(-2)?

This question is multiple choice, it is either A. -34, B. 0, C. 2, D. 7, E. 14 Lets say you were given the following problem:
A 20 foot ladder is leaning against a wall. The base of the ladder is 3 feet from the wall. What angle does the ladder make with the ground?

How would you solve this?