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otez555 [7]
2 years ago
7

The population of a strain of bacteria doubles in a culture. At noon there were 80 bacteria present and by 4:00 PM there were 20

480 bacteria. Determine algebraically the doubling period. Hint: You DO NOT need to use systematic trials.
Mathematics
1 answer:
Nastasia [14]2 years ago
3 0

Answer:

t = 1/2 hour

Step-by-step explanation:

20480 = 80x^{t }

20480 = 80x^{4 }

20480/80  =  x^{4 }

256 =  x^{4 }

x = 4

doubling period

2 = 4^{t}

t = 1/2 hour

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Arrange the numbers in the ascending order: 3/4,1/12,9/16,7/24
OLEGan [10]
Ascending means going up
First change into decimals
3/4=0.75
1/12=0.083
9/16=0.5625
7/24=0.291666…..

Start from smallest to largest number
0.291666…..,0.5625,0.75,0.083

Find their fractions
7/24,9/16,3/4,1/12

Answer:7/24,9/16,3/4,1/12
4 0
1 year ago
At right angles.)<br> 4 m<br> 4 m<br> 2 m<br> 2 m<br> 7 m<br> 2<br> 3 m<br> 7 m<br> 11 m
Arisa [49]

Answer:

71

Step-by-step explanation:

Area of fig 1 = 1 x b = 7 x 4 = 28

Area of fig 2 = l x b = (7-2) x 3 = 5 x 3 = 15

Area of fig 1 = 1 x b = 7 x 4 = 28 (same as ig 1)

Area of whole fig = fig 1 + fig 2 + fig 3 = 28+15+28 = 71

I hope im right !!

6 0
2 years ago
Read 2 more answers
PLZ HELP I BEEN SUCK FOE SO LONG PLZ RIGHT ANSWER I WILL CRY
mel-nik [20]

Answer:

40 students

Step-by-step explanation:

In this problem, one is given the ratio ( 8 : 3 ), since a ratio is another way of writing a fraction one can rewrite it as; \frac{8}{3} (8) represent the number of students who want to learn about magnets, and (3) represents the number of students who want to learn about magic tricks.

In the problem, it is also given that 25 more students wanted to learn about magnets compared to magic tricks. If one uses the parameter (x) to represent the factor by which the fraction \frac{8}{3} is reduced, then one can get the equation;

8x = 3x + 25

Use inverse operations to solve,

8x = 3x + 25

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5x = 25

/5

x = 5

Substitute back in to find out how many students want to learn about magnets,

8x

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3 0
3 years ago
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lora16 [44]
If I pick 10, then 2(10)+13=33
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8 0
3 years ago
Read 2 more answers
Solve the system of linear equations using elimination.
N76 [4]

Answer:

C (-2,1)

Step-by-step explanation:

−2x − y = 3 (1)

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(1) y = -2x - 3

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y = -2(-2) - 3

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y = 1

8 0
3 years ago
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