Isaac recorded the number of minutes he practiced on duolingo each day last week. Monday
20
Tuesday
30
Wednesday
25
Thursday
15
Friday
25
Which of the following is the mean absolute deviation for the set of data?
a4.0
b4.4
c4.9
d4.6

b

Step-by-step explanation:

20 + 30 + 25 + 15 + 25 = 115

115 / 5 = 23

20 - 23 = |-3|

30 - 23 = 7

25 - 23 = 2

15 - 23 = |-8|

25 - 23 = 2

3 + 7 + 2 + 8 + 2 = 22

22/5 = 4.4

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: