exam Maths Puzzle Numerical Ability

I really need help with the following problem. Thank you!

Science and Medicine: Find the time required for an object to fall to the ground from a building that is 1400 ft. high. Show thew formula and solve.

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exam Other Question

Could someone help me solve the following equation:
4x^2-11x-3=0
Thanks
(10+(square root 20))-(4-(square root 45))
I got 12+2(square root 20)-2(square root 45)
Am I even close?