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zheka24 [161]
3 years ago
10

The second termn in a geometric sequence is 20. The fourth termn in the same sequense is 45/4, or 11.225. What is the common rat

io in this sequence?
Mathematics
2 answers:
expeople1 [14]3 years ago
7 0

Answer:  

t2=ar^(2-1)

20=ar

then

t4=ar^(4-2)

45/4=ar.r

45/4=20.r

45/80=r

ohaa [14]3 years ago
6 0

Answer:

r=±0.75

Step-by-step explanation:

Given:

a2= 20

a4= 45/4

As a geometric sequence has a common ratio and is given by:

an=a1(r)^n-1

where

an=nth term

a1=first term

n=number of term

r=common ratio

Now

a2=20=a1(r)^(2-1)

20=a1(r)^1

20=a1*r

Also

a4=45/4=a1(r)^(4-1)

45/4=a1r^3

(a1*r)r^2=45/4

Substituting value of 20=a1*r

(20)r^2=45/4

r^2=45/4(20)

r^2=0.5625

r=±0.75!

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kompoz [17]
The answer should be 384.
Sorry if it's wrong.
6 0
3 years ago
PLZ HELP I NEED THIS IN 5 MINS <br><br><br><br>(23+3x)+(8x–41)=15
swat32

Hello from MrBillDoesMath!


Answer:

x = 3

Discussion:

( 23 + 3x)  + (8x-41) = 15        =>


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x = 33/11 = 3


Thank you,

MrB

7 0
3 years ago
Read 2 more answers
Tell whether each function is linear or non-linear. Function A Function B x 0 1 2 3 y 0 1 8 27 y = –x + 5
pogonyaev

Answer:

Please check the explanation.

Step-by-step explanation:

The slope-intercept form of the linear function  

y = mx+b

where

  • m is the slope
  • b is the y-intercept

The graph of y = mx + b is a straight line. Thus, y = mx + b represents a linear function.

<u>Analzing the function y = –x + 5</u>

Given the linear function

y = –x + 5

comparing with the slope-intercept form of linear equation

The slope m = -1

The y-intercept b = 5

Also, the graph of a linear function is a straight line.

Thus,

The function  y = –x + 5 represents  a linear function.

<u>Analzing the Table Function </u>

x        0     1     2     3

y        0     1     8     27

In order to identify whether the given table represents the linear function or not, we need to make sure the given function has a constant change x and y.

If there is a constant change in x and y, then it would be a linear Function otherwise it would not represent a linear function.

There is a constant change in x values.

i.e.

1 - 0 = 1

2 - 1 = 1

3 - 2 = 1

But, there is NOT a constant change in y.

i.e.

1 - 0 = 0

8 - 1 = 7

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It is clear that the table does not have a constant change in y-values.

Therefore, the table function does not represent the linear function

3 0
3 years ago
The graph of the function ƒ(x) = 4√x is shifted down by three units. What is the domain of the resulting function?
Katen [24]

Answer:

The domain of the transformed function is:

[0,∞)

Step-by-step explanation:

We know that the domain of  a function is the set of all possible values where the function is defined i.e. the possible x-values.

Now we are given a parent function f(x) as:

f(x)=4\sqrt{x}

Now, it is given that the function f(x) is transformed three units downward.

So, the resulting function g(x) is given as:

g(x)=4\sqrt{x}-3

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( Since, the square root function is not defined for negative real numbers and for rest values it is defined)

Hence, the domain is given as:

[0,∞)

8 0
3 years ago
What is the best estimate of the sum of the fractions? StartFraction 31 over 4 EndFraction + StartFraction 17 over 3 EndFraction
sergey [27]

Answer:

The answer is B

Step-by-step explanation:

none

3 0
3 years ago
Read 2 more answers
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