What number could replace the box so that the system of equations has infinitely many solutions?

A. -9

B. 3

C. 9

D. -3

What is the size of the matrix resulting from

State whether weight is a function of height for the six students and explain. a. yes, height is a function of weight because two students weigh 165 pounds but have different heights. b. no, height is not a function of weight because two students weigh 165 pounds but have different heights. c. yes, weight is a function of height because for each value of height there is one corresponding value of weight. d. no, weight is not a function of height because there is not enough data to determine a function.

What could explain what happened when the time was equal to 120 minutes