8y+7= y+21
Subtract y from both side
7y+7=21
Subtract 7 from both sides
7y = 14
Divide both sides by 7
Y=2 or A
Answer: 0.7471
Step-by-step explanation:
Given : The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population mean of
and a population standard deviation of
.
Sample size = 50
Using formula
, the z-value corresponding to x=98 will be:-

Z-value corresponding to x=103 will be:-

Using the standard normal distribution table for z-scores, we have
P-value = 
Hence, the probability we could select a sample of 50 adults and find that the mean of this sample is between 98 and 103 = 0.7471
What do u need help.with don't you have notes over it ...it's easy
Answer:
It has three solutions.
Step-by-step explanation:
- Elimination method
- Substitution method
- Graphical method
Here are the ones which i know.
Answer:it’s 0
Step-by-step explanation:
You do -3 plus 4 and then minus 1 which would be 0