Solve the system of equations.

4x + 4y +3z = 6

4x + 7y + 5z = 5

5x + 3y + 3z = 7

select the best answer from the choices provided

a. (x = 2, y = 1, z = -2) the answer !
b. (x = 4, y = -1, z= 0)
c. (x = 3, y = 0, z = -3)
d. (x = 1, y = 2, z = -1)

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours