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**Notsogoodatmaths** 1.I need to evaluate (x+x^3)dx with limits 2 and 1

You want to evaluate the integral $\displaystyle x+x^3$ between 1 to 2?

ii. estimate the above integral using the trapezium rule using 5 strips

2.i need to use the trapezium rule with 4 strips to estimate root(1+x^2) with limits of 4 and 0

3.the gradient function is dy/dx= 1/x^2 - xrootx what do you want to do here? Evaluate the integral with the trapezium method?

4.I need to find the stationary point of the graph y= (1/x) + (1/x^2) - (1/x^3) and need to determine their natures of each

The stationary point means: The point where the derivative is zero?

I need help with these 4 please. Dont think you have to answer them all, but i do need all the answers and working out Thanks

Need replies ASAP