exam Maths Puzzle Numerical Ability

Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not? Give examples.

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exam Other Question

Find the volume of a solid uniform crosssection with an area of 6.5 cm^2 and height, 24 cm. (take pi as 3.142)

I dont understand what the problem is asking for. Even if i did, I would not be able to solve it probably. Please help. solve the following equation for x

2x^2-4t+4=6