exam Maths Puzzle Numerical Ability

How would I go about multiplying this?

(2s + 5z)^2(s + 3z)^2

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exam Other Question

A bicyclist rode into the country for 5hours. In returning, her speed was 5mi/h faster and the trip took 4 hours. What was her speed each way? Given that a quadratic goes through the points (-1,0), (0.67,0), and (0,-2), find the quadratic that goes through the points and find the solutions.