-1/2(x + 2) + 1 + 1/2 x = 3
-1/2 x - 1 + 1 + 1/2 x = 3
0 = 3
x has no solution.
Do 24 times 25 and then divide that in half
The easiest way is to use (& to memorize) the sum formula for a AP:
Sum = 1st term added to the last term & multiplied by half the number of terms
S = (a+l)n/2
S = (5 + 53)(7/2) = 203
This is given by the multinomial coefficient:

If you're not familiar with the multinomial coefficient, you may be able to see it more clearly if you count the number of possible combinations taking each distinct letter

times, where

is the number of times it shows up in the original word.
Answer:
1. slope is 2
2. a is 5
3. b is 6
4. 0
Step-by-step explanation: