exam Maths Puzzle Numerical Ability

How do you complelty factor out, x^2 + 12xy + 35y^2, whats the answer?

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exam Other Question

A bicyclist rode into the county for 5 hours. In returning her speed was 5mi/h faster and her trip took 4 hours. What was her speed each way? I am supposed to use row reduction method to solve the system of equations Can you please help me? These are on a worksheet. Thank you in advance!!

A)
2x + y + z = -4
3x - y