exam Maths Puzzle Numerical Ability

I have to simplyfy the following problems. I thought I had the correct answer, but somewhere I did a mistake & can't figure out what it is.
The problems are:
1) (18/6)+[(3+5)82]

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exam Other Question

3(x - 4) > 7x - 9 What is the solution? In the polynomial below, what is the leading coefficient?

F(x)=1/4x^5+8x-5x^4-19

A. 8
B. 1/4
C. -19
D. -5
E. 2