What is the average of 1,2,4,and 9?

the answer is 4

hope this helps

To find the average (aka mean) of these numbers, all we have to do is add them all up, then divide that number by how many numbers we started with (4)

1 + 2 + 4 + 9 = 16

16 ÷ 4 = 4

Therefore, the average of the numbers is 4

Hope this helps

- AaronWiseIsBae

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"