exam Maths Puzzle Numerical Ability

Please help me with this homework question!Simplify B to the 7th power divided by B to the 2nd power times b to the 3th power.

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exam Other Question

Find a value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n.

I;m confused with the question. ANy help would be appreciated. Determine the value of K so that the line through the points (0,4) and (k-2,6) has x-intercept K