When doe augmented matrix have exactly one solution?

Find the unit vector u^ in the second quadrant of r2 that makes an angle of 2π/3 radians with the x-axis

Wrote the decimal equivalents of: 1/4, 1/2, 3/4

there are 1,200 muffins in a bakery. if 2/3 of the muffins are blueberry, how many muffins are blueberry.

Evaluate - 2x 2y, if x = - 3 and y = - 1. Evaluate - 2x 2y, if x = - 3 and y = - 1.

The sum of two number is 91. The smaller number is thirteen less than the large number. Find both numbers.

There are 62 guests who need to be seated at tables. Each table seats 9 guests. How many tables are needed to seat 62 guests?

The present shown below is a cube. Find the surface area of the present. cm 20 cm 20 cm 20 cm

All of the following are ways to write 25 percent of N except A. 0.25 N B. 25N/100 C. 1/4 N D. 25 N The answer is D but I want to know why

I'm picking a number between 1-20. I add 5, then I times the number by 3. Lastly I takeaway it by 15. My answer is 42. What was my beginning number? Clue: Do the opposite. 42 ADD 15 ...

Clara is a the sales person. She sold a brief case for $66 and earned 20% commission How much commission did Clara earn?