exam Maths Puzzle Numerical Ability

A 14-acre piece of land is being developed into home lots. If 2.8 acres of land will be used for roads, and each home site is to be 0.35 acre, how many lots can be formed?

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exam Other Question

1. What is the property of a*(b*c)=(b*c)*a
2. What is the property of b(c+a)=b*c+b*a
3. What is the property of a*b+0=a*b Write the following absolute value expression as a piecewise expression:

{{{abs(x^2-1)}}}

I basically don't understand the whole piecewise expression thing. Do I just break