3 to the negative second power is written like this:

.
When simplifying an expression with a negative exponent, you take a positive version of the exponent, in this case that would be 2, and apply that to the base.
After doing that, we have 9.
The next step is to put one over that number.
In this case, now after doing that the answer is

.
Hope this helps!
The answer to you question is
1/81
The Sum of 2 3/5-1 3/8 is 1.225
i hoped that helped u.
she would first calculate how many drinks she sell the other weeks and know the rate at which each customer buy the drinks.
Answer:
Let’s find out...
Step-by-step explanation:
21 x 13 = 273
(13 x 20) + (13 x 1) =
260 + 13 = 273
So this one matches
(21 x 10) + 213 =
210 + 213 = 423
Does not match
(30 x 13) - (9 x 13) =
390 - 117 = 273
This one matches
(20 x 10) + (1 x 3) =
200 + 3 = 203
Does not match