Answer:
65 miles per hour
Step-by-step explanation:
520 divided by 8
Answer:
Perpendicular(p)=21
base(b)=20
hypotenuse(h)=29
Step-by-step explanation:
Now by using the formula:
cos A=b/h
i.e 20 by 29
The answer is : 
Here are the steps below to help you! ^^
<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:
Step-by-step explanation:
If you want to solve this easily, you can just remove x and add 30x + 60x.
We know that 30 + 60 is 90. So we will add x to 90.
Now you have your answer!
Hope this helps!
