exam Maths Puzzle Numerical Ability

Around a rectangular garden of length 10 metre and width 5 metre, a road 1 metre wide is laid.The cost of metalling the road at $200 per metre^2 is

(a)$3400 (b)$6000 (c)$6800 (d

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exam Other Question

Add and express your answer in simplest form: x/18+3x/18 I came up with 2x/9 What did I do wrong here? Thanks Factor the polynomial F(x)=x^4-8x^3=17^2+2x-24
I need to factor this and show the work any help is greatly needed.