Write the equation of the line in y=mx+b form.

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.