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OlgaM077 [116]
3 years ago
9

The concentration of bacteria B in millions per milliliter after x hours is given by B(x)=1.33e^0.15x. After how many hours will

there be 31 million bacteria per milliliter?

Mathematics
1 answer:
BARSIC [14]3 years ago
6 0

Answer:

21 hours

Step-by-step explanation:

You want to find x such that B(x) = 31. Fill in the value and solve.

... 31 = 1.33e^(0.15x)

... 31/1.33 = e^(0.15x) . . . . divide by 1.33

... ln(31/1.33) = 0.15x . . . . take the natural log

... ln(31/1.33)/0.15 = x ≈ 20.992 . . . . hours

After 21 hours, the concentration will be 31 M/mL.

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Answer:

there is no solution

Step-by-step explanation:

Expand.

15x+35+2x=7x+10x-4515x+35+2x=7x+10x−45

2 Simplify  15x+35+2x15x+35+2x  to  17x+3517x+35.

17x+35=7x+10x-4517x+35=7x+10x−45

3 Simplify  7x+10x-457x+10x−45  to  17x-4517x−45.

17x+35=17x-4517x+35=17x−45

4 Cancel 17x17x on both sides.

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5 Since 35=-4535=−45 is false, there is no solution.

No Solution

4 0
3 years ago
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19. 140% of 60<br> find the percent of the number. Explain your method
KonstantinChe [14]

Answer:

84

Step-by-step explanation:

is                    x           140

----   SO ...    -------  =  --------

of                  60         100

(hit like pls)

60*140=100x

8400=100x

/100     /100

-------------------

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saveliy_v [14]
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There are 35 people who have
pentagon [3]
21 people are over 15
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