exam Maths Puzzle Numerical Ability

write the first five terms of the sequence
Tn=-0.2n+0.1

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You need to borrow $200,000 to purchase a new home. If the interest rate for a 30 year mortgage is 6.7% a year, what will your monthly payments be?

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Need help with setting up formula for: An express train is 19mph faster than a freight train. The express train travels 420 miles in the same time that it takes the freight train to travel 300 miles. Find the speed of each train.