exam Maths Puzzle Numerical Ability

If the sides of a square are lengthened by 7 cm, the area becomes 144cm^2. Find the length of a side of the original square.

The length of a side of the original square is _____ cm.

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exam Other Question

If a unique solution does not exist,how will I know if the system is inconsistent or dependent? How do I solve the following system?

5x+2y=30

x-4y=17 Simplify the expression.
Cos(2arctan(x))

arctan is just the inverse of tan Example tan^-1

i keep getting (1-x^2)/(1+x) althoutgh it keeps saying that its wrong