book Maths Puzzle Numerical Ability

A paleontonlogist finds a bone that has 25% of the amount of carbon-14 found in living b tissue. How old is the bone?

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book Other Question

The lengh of a rectangle is represented by (x-6) and the width of the rectangle is represented by (x+2). Express the area of this rectangle as a binomial in terms of x. WHAT IS MODULE?