Which angle must be complementary to angle 3?

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In a column proof the right column states your reasons

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?