Answer:
What is this ?
Step-by-step explanation:
Sorry i can't answer it because i can't see it.
<span>A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 18 minutes. How large a sample should she take to estimate the mean time to within 4 minutes with 97% confidence?
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n = [z*s/E]^2
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n = [2.17*18/4]^2 = 96 when rounded up
</span>
Answer:
4th option
Step-by-step explanation:
the absolute value function always gives a positive result, however, the expression inside can be positive or negative, that is
= 8 or - = 8
solving each equation
= 8 ( multiply both sides by 2 to clear the fraction )
x = 2 × 8 = 16
or
- = 8 ( multiply both sides by 2 )
- x = 16 ( multiply both sides by - 1 )
x = - 16
then x = - 16 , x = 16
Answer:
.... :)
Step-by-step explanation:
a regular hexagon has 3 pairs of parallel sides.
a regular octagon has 4 pairs of parallel sides.
those are the sides that are opposite the central angles.
