exam Maths Puzzle Numerical Ability

z^2-7z+10/z^2+4z-45

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exam Other Question

Karl determined that the ratio of trucks to cars sold at his car dealership last month was 3 to 7. If a total of 210 trucks and cars were sold last month, how many cars were sold? 9a^2- 64b^2

I tried to work this out but i am not sure this is correct can you let me know. thank you
(3a+8b)(3a-8b)