exam Maths Puzzle Numerical Ability

Subtract, using the vertical method.

7x squared + 6x from 9x squared - 3

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exam Other Question

A toy is assembled from 3 parts.If the probability that each part is defected is 0.1.Calculate the probability that the toy is defective. Find the vertices and asymptotes of the hyperbola given by:

(x^2/25)-(y^2/100)=1

Thanks a lot for your help!!!!