exam Maths Puzzle Numerical Ability

Simplify

6x^3-15x^2
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12x^2-60x

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exam Other Question

1. As the width of a confidence level increases, the lower bound ________ and the upper bound ________.

2. The batteries used in a digital watch have an operating life If y varies directly with x, and y = 64 when x = 4, find the constant of variation k.

I am totally lost with this problem can someone please give me a hand.

thanks.