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adelina 88 [10]
3 years ago
6

Please help quick!!!!!!!!!!

Mathematics
2 answers:
larisa [96]3 years ago
8 0

Answer:

Step-by-step explanation:

Un-shaded area = 3.14 x 2 squared = 12.56

Shaded area = (3.14 x 4 squared) - Area of un-shaded area

= 50.24 - 12.56 = 37.68

Brums [2.3K]3 years ago
3 0

Answer:

37.68 sq cm

Step-by-step explanation:

Area = pi x r²

Area shaded    = area whole circle minus area white circle

pi x 4² -pi x 2²

pi x 16 - pi x4

pi(16-4)

pi(12)

3.14 x 12 = 37.68

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Naddik [55]
\dfrac{\mathrm dx_1}{\mathrm dt}=\dfrac{2\text{ oz}}{1\text{ gal}}\dfrac{5\text{ gal}}{1\text{ min}}-\dfrac{x_1(t)\text{ oz}}{50\text{ gal}}\dfrac{5\text{ gal}}{1\text{ min}}
\dfrac{\mathrm dx_2}{\mathrm dt}=\dfrac{x_1(t)\text{ oz}}{50\text{ gal}}\dfrac{5\text{ gal}}{1\text{ min}}-\dfrac{x_2(t)\text{ oz}}{20\text{ gal}}\dfrac{5\text{ gal}}{1\text{ min}}

\implies\begin{cases}\dfrac{\mathrm dx_1}{\mathrm dt}=10-\dfrac1{10}x_1\\\\\dfrac{\mathrm dx_2}{\mathrm dt}=\dfrac1{10}x_1-\dfrac14x_2\\\\x_1(0)=10\\\\x_2(0)=15\end{cases}
6 0
3 years ago
I need this done in 15 mins pls help
Elza [17]

Answer:  35, 31, 25, 18

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
An online shopping club has 12,500 members when it charges $8 per month for membership. For each $1 monthly increase in membersh
-BARSIC- [3]

Answer:

Revenue  =  Members  *  (Cost Per Member)

R  = (12.500 *8) =

R= 100.000

R  = (12.500 - 500) ( 8 + 1)=

R=12000*9=

R=108.000

Step-by-step explanation:

Revenue  =  Members  *  (Cost Per Member)

R  = (12.500 *8) =

R= 100.000

R  = (12.500 - 500) ( 8 + 1)=

R=12000*9=

R=108.000

 

Where x represents the number of $1  increases

Where x represents the number of $1  increases

4 0
2 years ago
Determine the number of significant digits in the measurement <br> 0.79 cm
antiseptic1488 [7]
2 significant digits
5 0
3 years ago
Factor 81x²-25. Remember there is no middle term. This is a sum and difference of 2 squares.
natulia [17]

Hey there!!

Basic formula :

... a² - b² = ( a + b ) ( a - b )

Equation given :

... 81x² - 25

... ( 9x )² - ( 5 )²

... ( 9x + 5 ) ( 9x - 5 )

Hope it helps!!

5 0
3 years ago
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