exam Maths Puzzle Numerical Ability

show how to find the greatest common factor for:


42,90
34,68
56,150
28,45
60,350
40,68

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FOIL:

I understand how to do this. I just need a sanity check.

(a+7)(a-5)
My answer is this
a^2-2a+35
In the year 1998, there were -4.57 times 10 to the 7th power- cars in America. The population of America was -2.3 times 10 to the 6th power-. What was the average number of cars per person in America in 1998?
A. 0.5
B. 1.98
C. 5
D. 19.8