Answer:
how this helps
Step-by-step explanation:
3/(x-1) - 1/(x^2-1) = 5/(x-1)
Subtract 3/(x-1) from both sides
-1/(x^2-1) = 2/(x-1)
Factor x^2 - 1
-1/[(x-1)(x+1] = 2/(x-1)
Multiply by (x-1)(x+1) on both sides
-1 = 2 (x+1)
-1 = 2x + 2
Subtract 2 from both sides
-3 = 2x
Divide by 2 on both sides
-3/2 = x
Answer:
well yes, but no
Step-by-step explanation:
we can post other things than math but we shouldn't post it in the math forum
Answer:
Nevan won the game.
He scored 183 points.
Explanation:
Correct answer is worth 13/4 points
Incorrect answer is worth -1/4 points.
Number of correct answers = 58
Number of incorrect answers = 22
Point scored ![=58*\frac{13}{4} +22*\frac{-1}{4} =\frac{732}{4} =183](https://tex.z-dn.net/?f=%3D58%2A%5Cfrac%7B13%7D%7B4%7D%20%2B22%2A%5Cfrac%7B-1%7D%7B4%7D%20%3D%5Cfrac%7B732%7D%7B4%7D%20%3D183)
Points need to win = 90 points
Point scored, 183 >Points need to win, 90
So, Nevan won the game.
The probability of finding one of the two defective fuses is:
![\frac{2C1\times20C3}{22C4}=0.3117](https://tex.z-dn.net/?f=%5Cfrac%7B2C1%5Ctimes20C3%7D%7B22C4%7D%3D0.3117)
The probability of finding 2 defective fuses is:
![\frac{2C2\times20C2}{22C4}=0.026](https://tex.z-dn.net/?f=%5Cfrac%7B2C2%5Ctimes20C2%7D%7B22C4%7D%3D0.026)
Therefore the probability of rejecting is 0.3117 + 0.026 = 0.3377.