book Maths Puzzle Numerical Ability

Flying from Montreal to Miami in a plane. Plane leaves Montreal at 8:00am. and at 9:15am is flying over Washington, D.C. (assume straight line). Montreal to Miami is 2250km, Montr

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Please please please I need help for the following question asap :-(.

Show that if x2 > x1 then x2^3 + 2x2 + 7 > x1^3 + 2x1 + 7 for all x1, x2 which belong to R. Without using c place the following equations in the standard form of a quadratic equation (ax^2+bx+c=0)

a. 4/x^2+3/x-10=0

b. 6+4/x-1=5/x-3

c. 3.5x+4.6/x=1.2

please help