Help please. 1) If rank of a augmented matrix = number of unknown then the system has .

2) If rank of a augmented matrix < number of unknown then the system has .

Nikolas calculated the volume of the prism. his work is shown below.

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.

The length of the shadow of a building is 120 meters, as shown below: building shadow 120 m what is the height of the building? (1 point)