book Maths Puzzle Numerical Ability

can you please answer and explain step by step to this problem

12-[20-2(6 to the second power, divided by 3x2 to the second power)]

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book Other Question

Graph the polynomial. Find all intercepts, right and left side behavior.
f(x)=x^5-5x^4+6x^3+8x^2-40x+48 The Roman poet Virgil was born in 70 b.c. How old was he on his birthday in 42 b.c.?