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2 years ago

5

A bacteria culture contains 100 cells and grows at a rate proportional to its size. After one hour the population has increased

to 480. Find an expression for the number of bacteria after t hours.

1 answer:

xenn [34]2 years ago

7 0

We know it begins at 100. If we use a*b^t, then 100 is our a. 100*b^t. We can now divide 480 by 100. This is 4.8. 4.8 is b. f(t) = 100(4.8)^t

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A bookstore classifies its books by reader group, type of book, and cost. What is the probability that a book selected at random

Alina [70]

Answer:

A) 315/1005

Explanation:

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probability:

favorable choices/total choices

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1 year ago

40% written as a decimal

Natasha2012 [34]

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3 years ago

What two numbers multiply to -20 then add to -8?

VARVARA [1.3K]

Answer:

-10 and 2

Step-by-step explanation:

1. Think about what numbers multiply to -20: -10 and 2, 10 and -2, -20 and 1, 20 and -1, 4 and -5, -4 and 5

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2 years ago

Read 2 more answers

Stock A ‘s returns have a standard deviation of 0.5, and stock B’s returns have standard deviation of 0.6.The correlation coeffi

galben [10]

Answer:

The variance of the profile is 0.2179.

Step-by-step explanation:

We are given the following in the question:

$\sigma_A = 0.5\\\sigma_B = 0.6\\\rho_{A,B} = 0.5\\w_A = 70\% = 0.7\\w_B = 30\% = 0.3$

Variance of portfolio is given by:

$w_A^2\sigma_A^2 +w_B^2\sigma_B^2 + 2w_Aw_BCov_{A,B}$

$Cov_{A,B} = \rho_{A,B} \times \sigma_A \times \sigma_B \\=0.5\times 0.5 \times 0.6\\=0.15$

Putting values, we get,

$w_A^2\sigma_A^2 +w_B^2\sigma_B^2 + 2w_Aw_BCov_{A,B}\\=(0.7)^2(0.5)^2 + (.3)^2(0.6)^2 + 2(0.7)(0.3)(0.15)\\=0.2179$

Thus, the variance of the profile is 0.2179.

4 0

3 years ago

Use the drawing tools to form the correct answer on the graph.

TEA [102]

Answer: 9e9

Step-by-step explanation:

10^43 * 9e9 - w1 hex

7 0

2 years ago