QUESTION 5
What is the next number in the pattern: 1.-2, 5, 2, 9, 6, 13, ... ?
-6
10
20

10

Step-by-step explanation:

We can know the differences from each number

1, -2, 5, 2, 9, 6, 13, ...

~-3~7~-3~7~-3~7

The next number gonna be minus three again

So, 13 + (-3)

= 13 - 3

= 10

Hopefully help

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)