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Nostrana [21]
3 years ago
15

2/5 of a Number is what percentage of that number HELP

Mathematics
1 answer:
Nata [24]3 years ago
7 0

Answer: 40%

Step-by-step explanation: 100 ÷ 5 = 20 so 20 × 2 = 40

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A colony of bacteria is growing exponentially according to the function below, where t is in hours. About how many hours will it
Ivenika [448]
The function is:
B ( t ) = 4 * e^(0.8 t)
4 * e^(0.8 t) = 400
e^(0.8 t) = 400: 4
e^(0.8 t) = 100   / ln
ln e^(0.8 t) = ln 100  ( and since: ln e = 1 and ln e^x = x * ln e )
0.8 t = 4.6
t = 4.6 : 0.8 = 5.76 ≈ 6
Answer:
D ) 6 hours.
4 0
3 years ago
You make punch for a party. The ratio og ginger ale to fruit juice is 8 cups to 3 cups. You decide to add 4 more cups of ginger
Dvinal [7]
To get the answer we can use proportion
8 ginger ----------------- 3 fruit
12 ginger ----------------x
Crossmultiply now
8x=12*3                /:8
x=\frac{12*3}{8}
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To not change ratio we have to have 4.5 cups of fruilt juice. We initialy had 3, so we have to add 1.5 cup of fruit juice.
7 0
3 years ago
Anybodyyy know how to do thisss ???
Kamila [148]

Answer:

volume of a sphere is ⁴/³π r³

⁴/³ ×3.14 × 23³

3 goes into 3.14 , 1.047 times

4 ×1.047×23³

50939.17

Step-by-step explanation:

hope itade sense

8 0
3 years ago
Convert this to degrees<br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B3%7D%7B20%7D%20%5Cpi" id="TexFormula1" title=" \frac{3
dezoksy [38]
Here is the answer. Just click on the photo below. Hope this helps!

8 0
3 years ago
If cos 60° = 1/2 and sin 60º = root 3/2 find cos 240° and sin 240".
Vesnalui [34]

Answer:

cos 240 deg = -1/2   and   sin 240 = - root(3)/2

Step-by-step explanation:

if cos 60° = 1/2 and sin 60º = root 3/2 find cos 240° and sin 240".

we  know that  cos 240 =   cos  (60 + 180) =  - cos 60 =  - 1/2

cosine is negative when the angle is in the 3rd quadrant

sin 240 = sin (60 + 180) =  - root(3) /2

sine is also negative in the 3rd quadrant.

7 0
3 years ago
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