We are given the double number line shows that Jonah needs 28 seconds to fold 2 shirts.
Let us find the number of seconds to fold 1 shirt.
In order to find the number of seconds to fold 1 shirt, we need to divide 28 by 2.
On dividing 28 by 2, we get
28/2 = 14 seconds.
We need to find the number of seconds to fold 5 shirt.
Each 2 shirts needs 28 seconds.
Therefore, 4 shirts would need = 28 + 28 = 56 seconds.
And 5 shirts would need = 28 + 28 + 14 = 56 + 14 = 70 seconds.
Therefore, Jonah needs 70 seconds to fold 5 shirts.