The equations in this system were added to solve for y. What is the value of y? x + 6 y = 10. Minus x + 3 y = negative 15. Equals 9 y = negative 5.
y = Negative StartFraction 9 Over 5 EndFraction
y = Negative StartFraction 5 Over 9 EndFraction
y = StartFraction 5 Over 9 EndFraction
y = StartFraction 9 Over 5 EndFraction

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.