exam Maths Puzzle Numerical Ability

I am studying chemical equilibriums, and am having trouble remembering the algebra. Can you please explain to me how when solving this equation for x: (3.2 - 2x)/x = 1480, x= .

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exam Other Question

I need help with another problem. I am solving for b using a^2+b^2=c^2, where a=9, and c = square root of 17. When I worked through, I came up with
b^2=-64. This doesnt seem right. I have tried and tried and am just plain lost on this problem maybe you can explain to me how it works...My own teacher can not.

Find the x intercepts for the graph of the equation y=x^2+3x-10 I have to find the s intercepts? Can you help