book Maths Puzzle Numerical Ability

express each of the following in terms of a reference angle.
a)cos 236 degrees
b)sin 485 degrees
c)sin (-62 degrees)

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I can't seem to make out how to do this problem. it is so confussing. the problem is:
-7.5xs-0.9=-5.7x+4.5 The owners manual for a string trimmer says that a 16:1 ratio of gasoline to 2-cycle oil must be used for its fuel. How many gallons would be needed to go with an 8oz. packet of oil. If one 1 gallon is equal to 128 ounces?