Let's simplify step-by-step.
−4x−5−7+x+16
=−4x+−5+−7+x+16
Combine Like Terms:
=−4x+−5+−7+x+16
=(−4x+x)+(−5+−7+16)
=−3x+4
Answer:
=−3x+4
The two trains the same distance from Buffalo is 20
By assuming the standard deviation of population 2.2 the confidence interval is 8.67 toys,8.94 toys.
Given sample size of 1492 children,99% confidence interval , sample mean of 8.8, population standard deviation=2.2.
This type of problems can be solved through z test and in z test we have to first find the z score and then p value from normal distribution table.
First we have to find the value of α which can be calculated as under:
α=(1-0.99)/2=0.005
p=1-0.005=0.995
corresponding z value will be 2.575 for p=0.995 .
Margin of error=z*x/d
where x is mean and d is standard deviation.
M=2.575*2.2/
=0.14
So the lower value will be x-M
=8.8-0.14
=8.66
=8.67 ( after rounding)
The upper value will be x+M
=8.8+0.14
=8.94
Hence the confidence interval will be 8.67 toys and 8.94 toys.
Learn more about z test at brainly.com/question/14453510
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Answer:
About 27 weeks
Step-by-step explanation:
349.99/13 = 26.9 = 27
Answer:
x = 12
consider this a straight line:
A B C
-------------------------------------------------
<u>solve for AB</u>:
⇒ AB = AC - BC
⇒ AB = 2x - 7 - ( x - 3 )
⇒ AB = 2x - x - 7 + 3
⇒ AB = x - 4
<u>solve for x</u>:
⇒ x - 4 = 8
⇒ x = 8 + 4
⇒ x = 12