The simplified version of this expression is -4x.
Work
1. 1x-7x-(-2x)
2. 1x-7x+2x
Now just combine the terms.
3. -6x+2x
4. -4x
I think the answer is A. Cause your supposed to subtract so 7n-4n=3n, and 3-2=1 :) I hope this helps
Answer:
Step-by-step explanation:
Total number of balls =
Let S be the sample space.
Then, n(S) = Number of ways of drawing 2 balls out of 7
= ⁷ C₂
=
=21
Let E = Event of drawing 2 balls, none of which is blue.
∴n(E)= Number of ways of drawing 2 balls out of (2 + 3) balls.
= ⁵ C₂
=
= 10
∴ P (E) =