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Mathematics

1 answer:

ohaa [14]3 years ago

3 0

Mean 86.5 ((70,70,75,85,90,90,90,90,100,105 )/ 10 )
Median:90 (90+90 /2 = 90)
Mode: 90 (The number that comes up the most)

To find the quartiles just divide the data set in fours so that each set has three numbers.

Upper Quartile: 90
Lower Quartile: 75

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blagie [28]

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Lena [83]

So hmmm check the picture below

so, we're looking for dr/dt then at 4:00pm or 4 hours later

now, keep in mind that, the distance "x", is not changing, is constant whilst "y" and "r" are moving, that simply means when taking the derivative, that goes to 0

$\bf r^2=x^2+y^2\implies 2r\cfrac{dr}{dt}=0+2y\cfrac{dy}{dt}\implies \cfrac{dr}{dt}=\cfrac{y\frac{dy}{dt}}{r}\quad 
\begin{cases}
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r=130\\
y=120
\end{cases}
\\\\\\
\cfrac{dr}{dt}=\cfrac{120\cdot 30}{130}$