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It means that -2.75 diopters of refraction must be interposed in front of your eye,and added to the refraction of your cornea plus your natural lens, in order to causeimages to focus on your eye's retina.
multiple means multiple, plus means plus.
36 (3 to the power means times the number your multiplying with, so it is like this: 3x3+3x3=36)
You need to be very careful. In this example, 2^4 + 2^4 = 2 * 2^4 = 2^5 (where the ^ symbol means to the power of, and * means multiplied by.
It means find the value of the expression. It cannot be simplified in the way that algebraic expressions usually are.