book Maths Puzzle Numerical Ability

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Using the index of a sequence as the domain and the value of the sequence as the range, is a sequence a function?

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book Other Question

The diagonal of a rectangle is 10 inches and the area is 45 square inches. Find the dimension of the rectangle, correct to one decimal place. Solve the determinant
3 x
1 1 = 2

(the 3 x and 1 1 are inside determinant signs)