Really need help with these questions

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

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

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

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