exam Maths Puzzle Numerical Ability

A pile of logs has 24 in the fist layer,23 in the second layer,22 in the third layer,and so on. How many logs are there in 10 layers?

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exam Other Question

Find the center, vertices and foci of the ellipse. Graph the ellipse. would someone please explain this process fully, I've been somewhat confused and this question will be on th f(x)=3x^2-2x+4 ; find f(x+h)-f(x)