exam Maths Puzzle Numerical Ability

I have hourglass figure. Total h=10. Upper cone radius=3. Lower cone radius=5 Find Volume

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exam Other Question

How do you find the slope and y intersept on a graph? (this is 8th grade math) I am stuck on correct answer for:

what are all possible values of X such that X^2 = 5x

I am not using any specific book. I am just practicing..