answer: for example there is 12 and there is -12, as we can see they are opposites from each other so that means they are eliminated. i hope it helps
X=9 you take DE and EF and add them up and put it equal to DF which is the whole segment
Answer:
Divide the 7.5 by 3 to see how much bigger the ratio has to be.
7.5 / 3 = 2.5 so the ratio is 2.5 times bigger
multiply 5 by 2.5 to make the ratio equal and find the answer
5 x 2.5 = 12.5
It was 12.5 long and became 7.5 long
hope this helps. If you have any questions you may ask.
Step-by-step explanation:
√m/3 = 4
To remove the radical sign, square both sides.
(√m/3)² = 4²
m/3 = 16
To remove the denominator of 3, multiply both sides by 3.
3 (m/3) = 3(16)
m = 48
To check: Substitute m by its value.
√m/3 = 4
√48/3 = 4
√16 = 4
4 = 4
Answer:
a) The formula is given by mean 
the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.
b) 
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
If the distribution for X is normal or if the sample size is large enough we know that the distribution for the sample mean 
is given by:
Part a
The formula is given by mean the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.
Part b
The confidence interval for the mean is given by the following formula:
