book Maths Puzzle Numerical Ability

Bob has 3000 feet of fencing available to enclose a rectangular field.
A. express the area A of rectangle as a function of x where x is the length of rectangle.
B. for what value of x is the area largest?
C. what is the maximum area?

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book Other Question

How many arrangements of the letters in the word olive can you make if each arrangement must use three letters? Give the pair of inequalities,
Y>x+1

Y<3/2x + 3