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stira [4]
2 years ago
8

3. Dr. Silas studies the culture of bacteria under a microscope. The function b1(t) = 1200 (1.8)^t represents the number of bact

eria t hours after Dr. Silas begins her study. (a) What does the value 1200 represent in this situation? (b) What does the value 1.8 represent in this situation? (c) The number of bacteria in a second study is modeled by the function b1(t) = 1200 (1.8)^t What does the value of 1000 represent in this situation? What does the difference between 1200 and 1000 mean between the two studies? Answer:
Mathematics
1 answer:
Dominik [7]2 years ago
3 0

Answer:

  (a) the initial count of bacteria

  (b) the growth factor (per hour)

  (c) the initial count in the second study

  (d) the difference in initial counts between the two studies

Step-by-step explanation:

(a) 1200 is b1(0), the initial count of bacteria.

__

(b) 1.8 is the growth factor per hour, the factor that multiplies the previous hour's count to get this hour's count.

__

(c) Assuming b2(t) = 1000(1.8)^t, the value 1000 is the initial count of bacteria in the second study, b2(0).

__

(d) The difference between 1200 and 1000 means the first study started with 200 more bacteria than the second study did

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The height of a stuntperson jumping off a building that is 20 m high is modeled by the equation h = 20 -57, where t is the time
cupoosta [38]

A stuntman jumping off a 20-m-high building is modeled by the equation h = 20 – 5t2, where t is the time in seconds. A high-speed camera is ready to film him between 15 m and 10 m above the ground. For which interval of time should the camera film him?

Answer:

1\leq t\geq \sqrt{2}

Step-by-step explanation:

Given:

A stuntman jumping off a 20-m-high building is modeled by the equation

h =20-5t^{2}-----------(1)

A high-speed camera is ready to making film between 15 m and 10 m above the ground

when the stuntman is 15m above the ground.

height h = 15m  

Put height value in equation 1

15 =20-5t^{2}

5t^{2} =20-15

5t^{2} =5

t^{2} =1

t =\pm1

We know that the time is always positive, therefore t=1

when the stuntman is 10m above the ground.

height h = 10m  

Put height value in equation 1

10 =20-5t^{2}

5t^{2} =20-10

5t^{2} =10

t^{2} =\frac{10}{5}

t^{2} =2

t=\pm\sqrt{2}

t=\sqrt{2}

Therefore ,time interval of camera film him is 1\leq t\geq \sqrt{2}

7 0
2 years ago
The graphs of f(x) = 10x and its translation, g(x), are shown. On a coordinate plane, 2 exponential functions are shown. f (x) a
cricket20 [7]

Answer:

g(x)=(10)^{x-3}

Step-by-step explanation:

* <em>Lets explain how to solve the problem</em>

- The form of the exponential function is f(x)=a(b)^{x} , where

 a is the initial amount (x = 0) , b is the growth factor

- If b > 1 , then the function is exponential growth function

- If 0 < b < 1 , then the function is exponential decay function

- If the function translated horizontally by h units to the right , then

 the new function is g(x)=a(b)^{x-h}

- If the function translated horizontally by h units to the left , then

 the new function is g(x)=a(b)^{x+h}

- If the function translated vertically by k units up , then the new

 function is g(x)=a(b)^{x}+k

- If the function translated vertically by k units down , then the new

 function is g(x)=a(b)^{x}-k

* <em>Lets solve the problem</em>

∵ f(x) is an exponential function

∵ Points (0 , 1) , (1 , 10) , (2 , 100) belong to f(x)

- g(x) is the image of f(x) after translation

∵ Points (3 , 1) , (4 , 10) , (5 , 100) belong to g(x)

∵ point (0 , 1) on f(x) becomes (3 , 1) on g(x)

∵ point (1 , 10) on f(x) becomes (4 , 10) on g(x)

∵ point (2 , 100) on f(x) becomes (5 , 100) in g(x)

∵ All the y-coordinates of the points on the function f(x) are the same

 with the y-coordinates of the points on the function g(x)

∴ There is no vertical translation

∵ The x-coordinates of the points on the function f(x) are added by

   3 units to give the x-coordinates of the points on the function g(x)

∴ f(x) is translated 3 units to the right

∵ f(x)=(10)^{x}

∴ g(x)=(10)^{x-3}

- Look to the attached graph for more understand

# Red graph represents f(x)

# Blue graph represents g(x)

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Answer:addition and multiplication

Step-by-step explanation:

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Mamont248 [21]

Answer:

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Step-by-step explanation:

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8 0
2 years ago
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