exam Maths Puzzle Numerical Ability

i need explanation on the following if someone can help me understand the steps to these problems they are all but one in the back of the book but i want to understand them i have

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exam Other Question

A rectangular solid has a base with length 8 cm and width 3 cm. If the volume of the solid is 216 cm^3, find the height of the solid. what is the answer to -2x2 + 5x = 0

15c2 - 12c = 48


m2=4m - 4