book Maths Puzzle Numerical Ability

Can you please help me solve this: The volume of a cube is a funtion of the length of a side of the cube. Write a function for the volume of a cube. Find the volume of a cube with a side 13.5cm long.

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book Other Question

A 12 foot ladder is leaning against a wall. If the ladder reaches 8 feet high on the wall, what is the angle the ladder forms with the ground to the nearest degree? I came up with the answer y= 5/6x - 5/2...please check to see if this was correct.

Write the equation of the line passing through (-3,-5) and (3,0).

Thank you for your assistance,

JRR