Solve the system of equations using matrices. Use Gaussian-Jordan elimination.

6) 7x - y + 2z = 21

9x - 3z = 0

3y + z = 21

What is the answer to (14-5) / (9-6) =

Solve the quadratic equation by completing the square. x2 + 6x - 5 = 0 A) x = 3 ± 14 B) x = 1 ± 11 C) x = - 3 ± 14 D) x = - 1 ± 11

Let R be a ring with identity and let S be a subring of R containing the identity. Prove that if m is a unit in S then u is a unit in R. Show by example that the converse is false.

What is the sum of this mathematical question: 7.4 + 6.8

1. Find the present value. Amount per Payment: $820 Payment at the End of Each: 6 months Number of Years: 14 Interest Rate: 5% Compounded: Semiannually

Meredith picked 4 times as many green peppers as red peppers. If she picked a total of 20 peppers, how many green peppers did she pick?

Find diameter and radius if c = 43m

A flower bed has the shape of a rectangle 7 yards long and 4 yards wide. what is its area in square feet

A store buys 77 1 2 pounds of mulch in a large shipment. They divide the mulch up into bags that can each hold 2 1 4 pounds. The store sells one bag of mulch for $2.25. For each part of the question, show your work.

Which one of these is not like the other 25,60,35,20,22