Find the following integrals.
1. `int 3x^(7)dx` 2. `int 4 sqrt(x)dx` 3. `int(dx)/(sqrt(x))` 4. `int(x^(3)-5x^(2)+7x-11)dx`
5. `int (root3(x)-(1)/(root3(x)))dx` 6. `int 3 xdx` 7. `int 5x^(2)dx` 8. `int(1)/(2)x^(3)dx`
9. `int0.4 x^(4)dx` 10. `int 12x^(3) dx` 11. `int 15t^(2)dt` 12. `int(dtheta)/(theta)`
13. `int(4x^(2)-5x+1)dx` 14. `int(3x^(4)-5x^(3))dx` 15. `intx(8x-(1)/(2))dx` 16. `int 6x^(2)(x^(2)+x)dx`