X1 = -12 , x2 = 8 ... is the answer
Simply it as follows:
1 + 39 = 40
2 + 38 = 40 etc
18 + 22 = 40
19 + 21 = 40
There are 19 of these plus 40 itself . . .therefore 20 of them
20 x 40 = 800
And finally the last number not used, 20
Therefore 800 + 20 = 820
4-9= -5 that is the answer
Answer:
The approximate proportion of all university students that prefer to eat organic foods is 18 percent.
Step-by-step explanation:
