They are the complex conjugate pair, 1.5 - 3.1225*i and 1.5 + 3.1225*i where i is the imaginary square root of -1.
12x2= 24 just multiply 12 two times or you can add 12 two times.. those are possible suggestions
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5 times 12 =60 If you add 12 five times it comes out to 60.
You add six to two and you will get 8. If you wanted it six times more than two, you have to multiply the two numbers. You will get 12.
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The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).
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Add the raises together. A 10 dollar raise followed by a 12 dollar raise is a 10+12 = 22 dollar raise.