exam Maths Puzzle Numerical Ability

Please explain how you would solve this equation:

150x^2+120x+24

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exam Other Question

the elevator in the washington monument takes 75 seconds to travel 500 feet to the top of the floor. what is the speed of the elevator in miles per hour? (a) x+1/2=x+2/3
(b) 2x+3/x=2/3
(c) 3/x=2/1-x
(d) 2-x/3=2x-1/5
(e) 2x-3/4=2/3x
(f) x-1/2=2-x/3
(g) 1-k/3=k+2/2
(h) 2a-3/4=3-a/3
(i) 3/4=t/t+2
(j) 3/4=t/t+2