Discover Questions

Why is a test charge always very small? What mass of CH4 is contained in a 461 mL sample of CH4 at −59◦C and 330 torr? Answer in units of g.? Choose the table which contains the best values of x for finding the requested limit of the given function. Lim—>2 (x^2+8x-2)? Are we completely surrounded by other galaxies both above and below the plane of our milky way galaxy? or are they mostly above us? How to expect the range of following without graphing :
Sqrt(1-x^2)?