Step-by-step explanation:
It is 1 then 2 then 3
Bcz 1 2 5 6 9 10 11 12 13
Answer:
The simplified form of r^-7 + s^-12 is ----> 1/r^7 + 1/s^12
➺
P = Parentheses
E = Exponents
M = Multiplication
D = Division
A = Addition
S = Subtraction
The answer is D.