exam Maths Puzzle Numerical Ability

I really need help with this question. The base of an 18-ft ladder is 4 ft away from a wall. How far above the floor is the top of the ladder? Give all answers to the nearest thousandth

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exam Other Question

Using substitution to find the point (x,y)
y=3-2x
y=5+2x While I can solve basic quadratic equations I am having problems figuring out how to solve the equations where you complete the square when ax^2+bx+c is equal to a number other than 0. For example:

-2.2x^2-7.4x+0.7=0.8