book Maths Puzzle Numerical Ability

.....^
..../a
.../....
../......
./........
/bcd>

ignore the dots, they are filler to line everything up.
a) 5x-20
b) 2x+8
c) blank
d) 6x+

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book Other Question

given these points, write the equation of the line that contains them.

x y
0 380
5 445
10 510
15 575
20 640
25 705 Megrez, the nearest of the Big Dipper stars, is 6.6 x 10^17m from the Earth. Approximately how long does it take light, traveling at 10^16m/year, to travel from Megrez to the Earth?