exam Maths Puzzle Numerical Ability

How do you find the slope and y intersept on a graph? (this is 8th grade math)

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exam Other Question

Find the scalar equation of the plane that is perpendicular to the plane x + 2y + 4 = 0, contains the origin, and whose normal makes an angle of 30 degrees with the z-axis.

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