exam Maths Puzzle Numerical Ability

Can you help me with this equation?

Find the average of three test scores if the first two test scores are 80 and 84. Express your answer in terms of s, the third test score

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exam Other Question

hello. i have a question. about this problem i have been working on can u help?
the length of a rectangle is 2x-5 and its width is x+9. express the area of the rectangle. express the perimeter.

please help me. Can you please help me with this equation? 2x-1= x^2-4x+4