Show all work from question #3 onwards, and with the correct unit where needed.

1) Express the following numbers in scientific notation, to 3 significant figures: a) 0.0000008 b) 2,145,34000 c) 7 d) 7.6 billion 2) Convert the following numbers from scientific notation to regular decimal numbers: a) 1.08 x 103 b) 3.20 x 104 c) 5.00 x 10-3 d) 1.608x 10-1 3) Perform the following operations and express the final result in scientific notation: a) (3.5 x10-5) x (2 x1012) b) (6.4 x103) : (2 x 10-2) c) (2 x102) + (3 x103) 4) Solve the following equations for all possible values of x: a)x + 3(x - 1) = 2x + 1 b) - = 3 c) - (x + 5) - - = 0 d) X 16 5) a) How many seconds are there in a day? b) How many milliseconds are there in a day? c) How many days are there in a second? 6) The age of the universe is thought to be about 14 billion years. Write this in scientific notation, with 3 significant figures, in: (a) years, and (b) seconds 7) Write the following in scientific notation in their respective SI units (3 sig figs): a) 286.6 km, b) 0.864 um c) 760 mg d) 62.1ns