exam Maths Puzzle Numerical Ability

how can i work this out?

The length of a rectangular playing field is 5 ft less than twice its width.
If the perimeter of the playing field is 230 ft, find the length and width of the field.

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exam Other Question

34. In the regression equation, what does the letter �a� represent?
A) Y intercept
B) Slope of the line
C) Any value of the independent variable that is selected
D) None of the above The problem says: Find all zeros of: {{{ Q(x)=x^6-4x^5+5x^4-x^2+4x-5 }}}. I used Decartes Rule of Signs, Rational Zeros Theorem, and synthetic division to find that x=-1 and x=1