Identify the constraints on the system other than x ≥ 0 and y ≥ 0. Check all that apply. x + y ≥ 80

0.4x + 0.5y ≥ 100

6x + 4y ≤ 720

2x + 4y ≤ 400

6x + 2y ≥ 720

4x + 4y ≥ 400

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Solve the system of equations. y= 2x y= x^2 - 15

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15