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3 years ago

305 divided by 12.2=____

Mathematics

1 answer:

ra1l [238]3 years ago

7 0

305 divided by 12.2 equals 25. Have a nice day! ^ U ^

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Jim has a number (n) of CDs in his collection. Marcus has 5 less than 2 times the number of CDs Jim has. Which expression repres

9966 [12]

Use the expression the problem gave. Let n equal the number of CDs Jim owns.
n=# of CDs Jim owns
5 less means subtract
2 times means multiply let Marcus = number of Marcus's CDs
Marcus=5-2n

5 0

4 years ago

Read 2 more answers

A biologist recorded a count of 360 bacteria present in a culture after 5 minutes and 1000 bacteria present after 20 minutes. Wr

maksim [4K]

Answer:

$r = \frac{ln(\frac{25}{9})}{15}= 0.06811008317$

$A_o = \frac{360}{e^{5*0.06811008317}} = 256.0963179$

And our exponential model would be:

$A(t) = 256.0963179 e^{0.06811008317 t}$

Step-by-step explanation:

We want to adjust an exponential model given by this general expression:

$A(t)= A_o e^{rt}$

Where A(t) represent the number of bacteria after some t minuts

t represent the time in minutes

$A_o$ represent the initial amount of bacteria

$r$ represent the growth/decay rate

For this problem we know the following two conditions:

$A(5)= 360, A(20) = 1000$

Using the first condition we have this:

$360 = A_o e^{5r}$

We can solve for the initial amount $A_o$ and we got:

$A_o = \frac{360}{e^{5r}}$ (1)

Now using the second condition we have this:

$1000 = A_o e^{20r}$ (2)

Replacing equation (1) into (2) we have this:

$1000 =\frac{360}{e^{5r}} e^{20r} = 360 e^{15r}$ (3)

Now we can divide both sides by 360 and we got:

$\frac{1000}{360}=\frac{25}{9}= e^{15r}$

Now we can apply natural log on both sides and we got:

$ln(\frac{25}{9}) = 15r$

And solving for r we got:

$r = \frac{ln(\frac{25}{9})}{15}= 0.06811008317$

And replacing this value of r into equation (1) we got:

$A_o = \frac{360}{e^{5*0.06811008317}} = 256.0963179$

And our exponential model would be:

$A(t) = 256.0963179 e^{0.06811008317 t}$

8 0

3 years ago

Working together, 2 friends collected

Dominik [7]

Answer:

The two friends collecting the 4 buckets of seashells each get 2 buckets of their own.

Step-by-step explanation:

4/2=2

Mark me the brainliest please! :)

7 0

3 years ago

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What is the answer for -3x+12x

Serjik [45]

9x should be the answer

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3 years ago

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Solve for x . Your answer must be simplified. 10x<−3

zhenek [66]

This the answer i gotx<-3/10

3 0

4 years ago