Answer:
3
Step-by-step explanation:
Given the expression a --b
Given that
a = 2
b = 1
Substitute into the expression
a--b
= 2 --1
= 2 - (-1)
= 2 + 1
= 3
Hence the required value is 3
Answer: 
Step-by-step explanation:
Given the equation
you need to solve for the variable "b".
You need to apply Distributive property on both sides of the equation:

Now you need to add 21 to both sides of the equation:

Subtract
from both sides:

And finally, you can divide both sides of the equation by 18:

Answer:
Go to school
Step-by-step explanation:
Focuss in school
Answer:
A. 5
Step-by-step explanation:
just use calculator tbh