exam Maths Puzzle Numerical Ability

factoring a quadratic with leading coefficient greater than one
z^2+12z+20

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exam Other Question

The price of a 2-hour plumbing repair job is $140 and the price of a 5-hour job is $290. Use the slope to predict the cost of a repair job lasting 4 hours. How do you complete the following:

Solve (x-4)^2=25

Thank you in advance for your assistance and time.