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marin [14]
3 years ago
14

-27+9-3+1 using sigma notation

Mathematics
1 answer:
Vesna [10]3 years ago
4 0
Do you have question choices if not then I'll try I guess...... -27+9-3+1 36-3+1 3
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The area of a circular sun spot is growing at a rate of 1,200 km2/s.
Tpy6a [65]
A)

\bf \textit{area of a circle}\\\\
A=\pi r^2
\\\\\\
\cfrac{dA}{dt}=\pi \cdot 2r\cfrac{dr}{dt}\implies \cfrac{dA}{dt}=2\pi r\cfrac{dr}{dt}\implies \cfrac{\frac{dA}{dt}}{2\pi r}=\cfrac{dr}{dt}\\\\
-----------------------------\\\\
\left. \cfrac{dr}{dt}  \right|_{r=3000}\implies \cfrac{1200}{2\pi \cdot 3000}=\cfrac{dr}{dt}\\\\

B)

\bf A=\pi r^2\qquad A=490000\implies 490000=\pi r^2\implies \sqrt{\cfrac{490000}{\pi }}=r
\\\\\\
\left. \cfrac{dr}{dt}  \right|_{r=\sqrt{\frac{490000}{\pi }}}\implies \cfrac{1200}{2\pi \cdot \sqrt{\frac{490000}{\pi }}}=\cfrac{dr}{dt}

8 0
2 years ago
Gillian eats 12 skittles. If there was originally 25 skittles in the bag, what percent of the skittles did Gillian eat? (NOT A S
Maslowich

you divide 12 by 25 which is 0.48 and multiply it by 48 and the answer is 48%


4 0
3 years ago
20 POINTS !! IF YOU ANSWER THE QUESTIONS !
tatuchka [14]
12 the answer is 12 I know it
6 0
2 years ago
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kotykmax [81]

Answer:

Step-by-step explanation: 4848474838387398437939743927938<em>5</em>

7 0
2 years ago
Which equation is a point slope form equation for line AB ?
zepelin [54]
(-2,3)(4,-1)
slope = (3 + 1)/(-2 - 4) = 4/-6 = -2/3

equation
y + 1 = -2/3(x - 4)
7 0
3 years ago
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