exam Maths Puzzle Numerical Ability

-4/5 + 0.7 divided by 3/4

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exam Other Question

Write an equation of the line that passes through (9,6) and is perpendicular to the line whose equation is y=-1/3(x)+7. I need some help with this problem please.

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

I am not sure how to solve this can you help? Thank you.