exam Maths Puzzle Numerical Ability

perform the indicated operation involving rational expressions:
2x+14/x^2+14x+49
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11y x^2+2

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For the function by f(x)=2-x^2, 0<x or equal to, use a sketch to help find a formula for f^-1(x). Hello,


I need help with this problem:


The height, in feet, of a rocket t seconds after blast-off is given by a formula h=1260t-16t^2. After how many seconds will the rocket first reach a height of 23,400 feet?


Thank you