exam Maths Puzzle Numerical Ability

If a sequence contains the terms tn=-2n^2-5n+10,what is the value of t25? I got 2385 can someone please explain?

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exam Other Question

Looking to verify adding (or subtracting) logarithms to a single logarithm. I have: "log 5 250 - log 5 10". I believe that if they are the same base, you can simply substract the 250 from 10 to equal 240 (e.g. log 5 240). Right? Thanks in advance. Which is a an example of a unit multiplier?

a) 12in/1ft

b) 12/1

c) 1/12

d) none of these