exam Maths Puzzle Numerical Ability

Hi Can you help me solve the following problem?

Use the given information to find the constant of proportionality.
W is inversely proportional to the square of r. If r = 2, then W = 10.
k =

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exam Other Question

Hi!
Please help me, with this question, the problem says:
Evaluate each of the following if a=3 and b=4
(a-b)^3
Please and Thank You=) Determine whether the following equations have a solution or not? Justify your answer.

x2 + 6x - 7 = 0

z2 + z + 1 = 0