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Sauron [17]
2 years ago
9

Can someone please help me(20 points will give brainliest!!!)

Mathematics
1 answer:
erica [24]2 years ago
3 0
-3f im pretty sure…
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Question part points submissions used this exercise involves the formula for the area of a circular sector. find the area of a s
kolezko [41]
The formula for the area of a sector in radians is  A= \frac{1}{2}r^2 \theta,  where theta is the angle in radians.  For us, the formula looks like this:   A= \frac{1}{2}(9)^2* \frac{3 \pi }{5}.  Doing all the multiplication on that gives us  A= \frac{243 \pi }{10}.  Multiplying in pi and rounding to the nearest tenth gives us an area of 76.3 meters squared.  You can use the formula for the area of a sector with the angle in degrees as well.  Just replace the 360 degrees with 2pi and it works the exact same way.
6 0
2 years ago
At a greengrocer, two bananas and one apple cost ?1.16 and one banana and one apple cost ?0.71. How much does one apple cost?
Blababa [14]

Answer

Find out the how much does one apple cost .

To prove

Let us assume that the number of bananas be x .

Let us assume that the number of apples be y .

As given

At a greengrocer, two bananas and one apple cost $1.16 .

Than the equation becomes

2x + y = 1.16

one banana and one apple cost $0.71.

Than the equation becomes

x + y = 0.71

Subtracting x + y = 0.71 from 2x + y = 1.16

2x - x + y - y = 1.16 - 0.71

x = 0.45

Put in the equation x + y = 0.71

0.45 + y = 0.71

y = 0.71 - 0.45

y = $0.26

Therefore the cost of the one apple is  $0.26 .


4 0
3 years ago
a quantity of ethanol is cooled from 47.9° C to 12.3°C and releases 3.12 KJ of heat. what is the mass of the ethanol sample?​
victus00 [196]

Answer:

35.9 grams

Step-by-step explanation:

We use the formula:

q=m*C_p*\Delta T

Where

q is heat released

m is mass

C_p is the constant 2.44

ΔT is change in temperature

We put the info in the formula and solve for m (mass):

q=m*C_p*\Delta T\\-3.12 =  m*2.44(12.3-47.9)\\-3.12*10^3=m*(-86.864)\\m=35.9

The mass of ethanol is 35.9 grams

8 0
3 years ago
Con ayuda de tu familia formula un
Mademuasel [1]

https://youtu.be/GZcm4mswivc

espero que te ayude

5 0
3 years ago
Please help no links please
pashok25 [27]
Can you comment to me because it won’t allow me to send it on here it sends me a copy but you won’t be able to click on it

explain
5 0
3 years ago
Read 2 more answers
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