Answer:
120
Step-by-step explanation:
From 20, choose 3:
₂₀C₃ = 120
Here we use combinations instead of permutations because the order doesn't matter.
Answer:
I think this is helpful .
Answer:
5x^2+3x^2+(3x+1)^2+(2x-4)^2
Answer:
78
Step-by-step explanation:
7+8/2 multiply by 6
Answer:

Step-by-step explanation:
The equation they are giving is:

Multiply both sides by 7 to get:

Subtract 4x from both sides to reach:

Therefore,
.
Hope this helps :)