exam Maths Puzzle Numerical Ability

i did this problem i just want to see if i did it right..


what is the domain?

7-X/5x^2-18x-8


thanks for your help

angela

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exam Other Question
(t+2)^3(t^2+2t+1)(t+1) over (t+1)(t^2+4t+4)(t+2)

show work The length of a rectangle is 4 less than 3 times the width. If the perimeter is 40, find the dimensions of the rectangle.
I really need help!!