Answer:
Step-by-step explanation:
To solve:
x - 8 = -20
Simply add +8 to both sides of the equation.
It becomes :
x - 8 +8 = -20 + 8
Note that, -8 + 8 will cancel out, and results to zero.
Therefore the equation becomes :
x = -20 + 8
x = -12.
Hope this helped!
<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>
Is just a set of two or more linear equations. In two variables (x and y) , the graph of a system of two equations is a pair of lines in the plane.
Answer:
4π/3 square units
Step-by-step explanation:
Triangle XYZ is equilateral,
The central angle of the sector is 120°, or 2π/3 radians.
The area of a sector of central angle β is given by
.. A = (1/2)r^2*β . . . . . . β in radians
.. A = (1/2)*2^2*(2π/3) = 4π/3 square units
Answer:
Joe is 18
Step-by-step explanation:
represent mike as m, so m=3 and joe as j,
If Joe is 6 times as old as mike then j = 6(m)
Plug in for m=3 so you get j= 6(3)
Simplify: J= 18
