Answer:
12ft
Step-by-step explanation:
Hope I helped!
May you give me brainliest if it is right?
Answer:
Step-by-step explanation:So we know x + y = 21 and 5x +10y = 165 We line them up in columns x + y = 21 5x +10y = 165 To eliminate the x variable, I'll multiply every element in the 1st equation by -5. -5x + -5y = -105 5x + 10y = 165 Now we combine (add) the equations, which eliminates x altogether. 5y = 60 ... y = 12 From there, x + 12 = 21 ... x = 21-12 ... x = 9 You should double check. Do 9 nickles and 12 dimes equal $1.65? A very important thing to remember using this method is to do the same thing to each element in the equation that you change! I hope that helps.
Solution :
Group Before After
Mean 693.75 743.75
Sd 155.37 143.92
SEM 54.93 50.88
n 8 8
Null hypothesis : The preparation course not effective.
![$H_0: \mu_d = 0$](https://tex.z-dn.net/?f=%24H_0%3A%20%5Cmu_d%20%3D%200%24)
Alternative hypothesis : The preparation course is effective in improving the exam scores.
(after - before)
The answer is A) shifts right by 9 units