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nexus9112 [7]
1 year ago
15

Under ideal conditions a certain bacteria population is known to double every three hours. Suppose that there are initially 100

bacteria. Estimate the size of the population after 20 hours.
Mathematics
2 answers:
Mandarinka [93]1 year ago
6 0

Answer:

The answer is "10159"

Step-by-step explanation:

Every 3 hours the population doubles, with an initial population of 100.

\to P(t) = 100 \times  2^{\frac{t}{3}}

P(t)= \text{The population of bacteria}\\\\ t = \text{time in hours} \\

when t=20

\to p(20)= 100 \times 2^{\frac{20}{3}} \\

             = 100 \times 101.593667\\\\ =10159.3667

lara [203]1 year ago
3 0

Answer:

the estimation of the size of the population after 20 hours is 10159

Step-by-step explanation:

The computation of the size of the population after 20, hours is shown below;

= 100  2^(20 by 3)

= 10159.36

If we divide 20 by 3 so it would give 6.66 that lies between 6 and 7

So the estimation of the size of the population after 20 hours is 10159

hence, the same is relevant

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Laura Bernett is 5 ft-4 inches tall. She stands 12 feet from a streetlight and casts a 5-foot-long shadow. How tall is the stree
Sidana [21]

Answer: the height of the streetlight is 19.47 feet

Step-by-step explanation:

The height of Laura Bernett is 5 ft-4 inches.

12 inches = 1 foot

4 inches = 4/12 = 1/3 foot

Therefore, her height is

5 + 1/3 = 16/3 foot

The diagram of the scenario is shown in the attached photo

The right angle triangle ABC and EBD formed are similar.

h represents the height of the streetlight

Total length of AB = 12 + 5 = 17 feet

Considering triangle BDE,

To determine the angle formed, θ, we would apply trigonometric ratio

Tan θ = opposite side/adjacent side

Tan θ = (16/3)/5 = 1.067

θ = 46.86 degrees

Considering triangle ABC,

Tan θ = h/AB

Tan 48.86 = h/17

h = 17tan48.86 = 17 × 1.145

h = 19.465

To the nearest hundredth,

h = 19.47 feet

6 0
2 years ago
CL 6-131. Solve each system using the method of your choice.
shepuryov [24]

System 1: The solution is (x, y) = (-4, 5)

System 2:  The solution is (x, y) = (\frac{11}{3}, -3)

<em><u>Solution:</u></em>

<em><u>Given system of equations are:</u></em>

2x + 3y = 7 ------ eqn 1

-3x - 5y = -13 --------- eqn 2

We can solve by elimination method

Multiply eqn 1 by 3

6x + 9y = 21 ------ eqn 3

Multiply eqn 2 by 2

-6x - 10y = -26 ------- eqn 4

Add eqn 3 and eqn 4

6x + 9y -6x - 10y = 21 - 26

-y = -5

y = 5

Substitute y = 5 in eqn 1

2x + 3(5) = 7

2x + 15 = 7

2x = -8

x = -4

Thus the solution is (x, y) = (-4, 5)

<h3><em><u>Second system of equation is:</u></em></h3>

8 - y = 3x ------ eqn 1

2y + 3x = 5 ----- eqn 2

We can solve by susbtitution method

From given,

y = 8 - 3x ----- eqn 3

Substitute eqn 3 in eqn 2

2(8 - 3x) + 3x = 5

16 - 6x + 3x = 5

3x = 16 - 5

3x = 11

x = \frac{11}{3}

Substitute the above value of x in eqn 3

y = 8 - 3x

y = 8 - 3 \times \frac{11}{3}\\\\y = 8 - 11\\\\y = -3

Thus the solution is (x, y) = (\frac{11}{3}, -3)

4 0
2 years ago
Yasmin has a bag containing 165 colored beads. Her classmates take turns selecting one bead from the bag without looking, record
aivan3 [116]

Answer:

I think the answer is orange 17

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
A student solved the problem below by first dividing 20 by 10. What mistake did the student make? A baseball team has won 20 gam
andreev551 [17]

Answer:


Step-by-step explanation: The student divided the number of wins by the number of losses.

The student should have divided the number of wins by the total number of games.

The student should have first added 20 and 10 to find that there were a total of 30 games.



8 0
2 years ago
Read 2 more answers
A triangular banner has an area of 351cm2. The length of the base is two centimeters longer than four times the height. Find the
Xelga [282]

Answer:

h = 13cm and b= 54cm.

Step-by-step explanation:

We have that the area A=351cm^2 and the base is two centimeters longer than four times the height, that is

b = 2+4h

where b is the base and h the height. Now, the area is

A=\frac{b*h}{2}

351=\frac{(2+4h)h}{2}

702=2h+4h^2

4h^2+2h-702=0.

Now, we are going to use the general formula to solve quadratic ecuations:

h=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

where a=4, b= 2 and c= -702.

h=\frac{-2\pm\sqrt{2^2-4(4)(-702)}}{2*4}

h=\frac{-2\pm\sqrt{4+11232}}{8}

h=\frac{-2\pm106}{8}

h=\frac{-2+106}{8} or h=\frac{-2-106}{8}

As we are searching for the lenght, we choose the positive result:

h=\frac{-2+106}{8}=13cm

b=2+4h = 2+52 = 54cm.

5 0
1 year ago
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