Find the length, d, in simplest radical form, of the diagonal of a cube with sides of s units.

Find the multiplicative inverse of 8-12i

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?