Exam Maths Puzzle Algebra

Solve for x
4x^2 + 200x - 2400 = 0

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Exam Other Question

None of the cars finished the race here is what happened car A broke 1/9th into last 3rd of race. How far did car A go?car B completed the first 1/2 of 13/16th of the race how far did car B go? car C broke with 1/3 left of race, how far did car C go? car D broke with 1/5 of the last 5th of race completed, how far did D go? car E went 1/2 as far as car B how far did car E go? Car F went 2/3 as far as car B how far did car f go? Who went the farthest? who went the shortest. Find the value of x and each unknown angle measure. (x+5) (x+5) and 3x