exam Maths Puzzle Numerical Ability

How do you graph a quadratic functions for Example f(x)=x squared+4x-7?

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exam Other Question

how do you find the solution of the x when the equatins are like this..
2x^3+5x-7= 0 plz tell me step by step so i can try it with other problems. Please help. Word problems are the worst!
A ball is thrown vertically upward at an initial speed of 64 ft/sec. Its height (in feet) after t seconds is given by h(t)=t(64-16t). After how many seconds does the ball reach its maximum height?