X + 2y + 3z = 4 2x + 5y + (t + 6)z = 9
x + (t + 2)y + 4z = 3

What is the answer? And does the answer contain:
No solution
One solution or
Many solutions?

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?

This is so hard and it’s for a test

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)