exam Maths Puzzle Numerical Ability

Solve proportion b/3=-3/4

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Hi, I really need some help with this problem. Thank you so very much in advance! Here is the question...

The Diameter of Mars is about 4,000 miles. Find the approximate volume.

Thanks again!
Write an equation for the hyperbola that satisfies each set of conditions.

vertices (9,-3) and (-5,-3), foci at (2(+or-)the square root of 53,-3)