I have to approx how many prime number there are between 2 to 50 000 by using  int(1/ln(t),t=2..50000);

I need to use (to approximate):

a) rectangle method

b) trapezoid method

c) simpsons method

However, I can not use the fonction like simpson(1/ln(t),t=2..50000); to solve them, I need to go with the definition and I have no idea how.

Can any1 help me?

> y1 := x-> piecewise(0<=x<=c, m1*x+b1, c<x<=1, m2*x+b2);

Error, unexpected relational operator

I don't know why it gives me this error, I underline where the cursor goes. Can anyone tell me what is my error?

Thanks

I have 2 functions, f(x) and g(x) both continous on [a,b] (a known interval). For which value of C ε [a,b] the area under f(x) and g(x) is minimal?

I know f(x) and g(x).

I have 2 functions, f(x) and g(x) both continous on [a,b] (a known interval). For which value of C ε [a,b] the area under f(x) and g(x) is minimal?

I know f(x) and g(x).

I had the worst physic's teacher in High School so we did not learn a single thing. If you guys could help me I'd appreciate! I need to find the angle if A throws a rock at C. He throws his rock at 20m/s. C is on a 8metres building. A is 10metres away from C. With which angle (theta) A needs to throw his rock to hit C. Situation: http://img522.imageshack.us/my.php?image=problemkk3.jpg Equation: http://img519.imageshack.us/my.php?image=physicequationpa1.jpg