2x + y - z = -8 2y + 3z = -6 -x + y + z = -4 for the following matrix, which of the following matrix operations would result in a11 = 1?

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

How do you solve a question like this?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.