book Maths Puzzle Numerical Ability

Solve the equation and describe each step to use for 1/5 (10a - 15) = 3x

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book Other Question

This proble involves a function rule..
Input X 1 2 3 4 5 6
Output Y 3 2 1 0 -1 -2
We need to determine the function rule.

Another one..
Input X 1 2 3 4 5 6
Input y 1 3 5 7 9 11

Thanks!
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?