exam Maths Puzzle Numerical Ability

At 71 km/h, how far can you travel in 7.5 h? Use unit analysis to check your answer.

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exam Other Question

The problem is: The area of a rhombus is one-half the product of the lengths of its diagonals.

I know the answer as with the previous problem, I just do not know how to go about writing a proof for this.

Thank You Given f(x) = -x3 - 3x2 + 3x + 7, find f(-1), f(0), and f(2)