exam Maths Puzzle Numerical Ability

What is the formula for this sequences of numbers?
60 50 40 30 20

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exam Other Question

Please help.
Factor the trinomial.
16x^2 + 40xy + 25y^2 A city is growing exponentially at a rate of 1.5% annually. Its population is currently 56,750 people. Predict the population in 10 years.