exam Maths Puzzle Numerical Ability

Theta = x
If x is an acute angle with cos x = 1/9, find the exact value of sin a/2.

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exam Other Question

The line through the points (4,5) and (10, -2) A rectangle has an area of X^3 - 6X^2 + 15X - 28 square feet. Its width is X - 4 feet.

What is its length?