# How to solve these equations

I'm considering a coursera astronomy course and two of the prerequisites are listed below :

Could provide me with an explanation of how to solve points 2 & 3 above ?

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1) logarithms 2) Basic equations –  Gautam Shenoy Nov 19 '12 at 11:17
@Gautam, do you think that's helpful? –  Gerry Myerson Nov 19 '12 at 11:17
user, you're not going to get "a familiarity with the rudiments of high-school algebra" from an answer on math.stackexchange. You're going to need to find a refresher or bridging course somewhere, and do that before you try the astronomy course. –  Gerry Myerson Nov 19 '12 at 11:20
There's no need for logarithms in question 1. $-2.3 \times 10^{13} \times .8 \times 10^{-28} = (-2.3 \times .8) \times (10^{13} \times 10^{-28}) = -1.84 \times 10^{-15}$. –  littleO Nov 19 '12 at 11:24
@user470184, Gerry's advice is a sound one, imo: if you're serious about a course in astronomy you're going to need waaaaay more than answers to two questions. Think of taking a remedial course in algebra/geometry/calculus in that college/university –  DonAntonio Nov 19 '12 at 11:33
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