exam Maths Puzzle Numerical Ability

If a and b are real numbers and a2 = b2, does a = b? can this be explained to me?

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exam Other Question

how do you do fractions, all types? A backyard has dimensions 1 1/2 yards by 2 4/5 yards. What is the area of the back yard in square yards (yd2)?
these are whole numbers and fractions and the yd the 2 are one of those tiny numbers.