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8090 [49]
3 years ago
12

a culture started with 3,000 bacteria. after 8 hours it grew to 3,300 bacteria. predict how many bacteria will present after 12

hours. round your answer to the nearest whole number.
Mathematics
2 answers:
Sloan [31]3 years ago
5 0

Answer:

Step-by-step explanation:

11Alexandr11 [23.1K]3 years ago
3 0
3,300 - 3,000 = 300
In eight hours, 300 bacteria grew.
300 / 8 = 37.5
In every hour, 37.5 bacteria grew.
37.5 x 12 = 450
In twelve hours, 450 bacteria will grow.
3,000 + 450 = 3,450
In total, there will be 3,450 bacteria in twelve hours :)
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A gym has 2kg and 5kg weights. There are 10 disks in all. The total weight of 2kg and 5kg disks is equal to 29kg. Find the numbe
Simora [160]

Answer:

no of 5 kg disks is 3, and no of 2 kg disks is (10-3) i.e. 7

Step-by-step explanation:

Let the no of 2kg disks be a.

Let no of 5 kg disks be b.

2a+5b=29

a+b=10

Using substitution, we have

2(10-b) + 5b=29

20-2b+5b=29

20+3b=29

3b=9

b=3

So no of 5 kg disks is 3, and no of 2 kg disks is (10-3) i.e. 7

6 0
4 years ago
Determine the sum of the arithmetic series: 5+18 +31 +44 + ... 161.
Finger [1]

Answer:

1079

Step-by-step explanation:

Hello,

18-5 = 13

31-18=13

44-31=13

161=5+13*12

So we need to compute

\displaystyle \sum_{k=0}^{k=12} \ {(5+13k)}\\\\=\sum_{k=0}^{k=12} \ {(5)} + 13\sum_{k=1}^{k=12} \ {(k)}\\\\=13*5+13*\dfrac{12*13}{2}\\\\=65+13*13*6\\\\=65+1014\\\\=1079

Thanks

3 0
4 years ago
Write an inequality for people younger than 8 get in for $45
Tema [17]

Answer:

8 ≤ $45

Step-by-step explanation:

Given:

People younger than 8 get in for $45.

Now we can assume that the cost given might be to enter in the garden or might be in fair or might be at museum or might be at a zoo which is $45 for people which are younger than 8.

Now we can say for people younger than 8 means people or children who are of 8 years or who are below 8 years or say less than 8 years.

Hence we can say people who are less than or equal to 8 get in for $45

So the inequality equation becomes.

8 ≤ $45

6 0
3 years ago
Choose the equation that best represents the equation of the graph of f(x) = 3^x +4.
Alchen [17]
The answer would be D
4 0
3 years ago
I need help, sleps plzz , i dont understand plzzz dont ignoree!!!!!!!!!!!!
denpristay [2]

Answer:

x = \frac{3+\sqrt{105} }{8}  , \frac{3-\sqrt{105} }{8}  x=1.655,-0.905

Step-by-step explanation:

3x+6 = 4x^2

4x^2 -3x -6 = 0

x = \frac{3+\sqrt{105} }{8}  , \frac{3-\sqrt{105} }{8}  x=1.655,-0.905

7 0
3 years ago
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