exam Maths Puzzle Numerical Ability

hi i cant seem to work out how to get the formulas that contains n.
terms 1 2 3 4 5 6 7 8 9 n
sequences 10 40 90 160 250 36

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exam Other Question

The formula b(t) = 1.353(1.9025)^t represents the number of broadband internet users (in millions) where t if the time in years measured from 1998. How many broadband users (to the nearest million) does this formula predict for 2004? Mary and Lucy both leave from the same bus station. Mary drives 10mph slower than Lucy. In three hours, the are 260 miles apart. How do you set up an equation to solve?

~Confidently Confused~