In each of problems 11 through 28, find the general solution of the given differential equation. 11. y − y − y + y = 0 12. y − 3y + 3y − y = 0 13. 2y − 4y − 2y + 4y = 0 14. y(4) − 4y + 4y = 0 15. y(6) + y = 0 16. y(4) − 5y + 4y = 0 17. y(6) − 3y(4) + 3y − y = 0 18. y(6) − y = 0 19. y(5) − 3y(4) + 3y − 3y + 2y = 0 20. y(4) − 8y = 0 21. y(8) + 8y(4) + 16y = 0 22. y(4) + 2y

Simplify this expression.2(10) + 2(x – 4) a. 2x + 16 b. x + 12 c. 2x + 12 d. x + 16

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.