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expeople1 [14]
2 years ago
13

Aurora is planning to participate in an event at her school's field day that requires her to complete tasks at various stations

in the fastest time possible. To prepare for the event, she is practicing and keeping track of her time to complete each station.
The x-coordinate is the station number, and the y-coordinate is the time in minutes since the start of the race that she completed the task.

(1, 4), (2, 8), (3, 16), (4, 32)

Part A: Is this data modeling an arithmetic sequence or a geometric sequence? Explain your answer. (2 points)

Part B: Use a recursive formula to determine the time she will complete station 5. Show your work. (4 points)

Part C: Use an explicit formula to find the time she will complete the 8th station. Show your work. (4 points
Mathematics
2 answers:
igor_vitrenko [27]2 years ago
8 0

For those who don't understand:

Part A:

Geometric as each number is multiplied by 2

We can see it

---------------------------------------------------------------------------------------------------------------

Part B:

We see that if s is station and t is time then

Ts=3 x 2 to the power of 8 minus 1 end exponent

Which is the required recursive formula to determine the time

=t5

=3 x 2 to the power of 5 minus 1 end exponent

=3 x 16

= 48

So on the fifth time is 48

---------------------------------------------------------------------------------------------------------------

Part C:

the time she will complete station 8:

=t8

=3x2 to the power of 8 minus 1 end exponent

=3x2 to the power of 7

=384

the time she will complete station 9:

=t9

=3x2 to the power of 9 minus 1 end exponent

=3 x 2 to the power of 8

=768

the required time she will complete the 9th station:

=t subscript 9 minus t subscript 8

=768-384

=384

Remember to change or else u get a 0%

ivann1987 [24]2 years ago
4 0

Aurora's plan is an illustration of a geometric sequence.

  • The recursive function is T_n = 2 T_{n-1.
  • She will complete the 8th station in 512 minutes

From the question, we have:

(x,y) = \{(1,4),(2,8),(3,16),(4,32)\}

<u>(a) The pattern model</u>

To check if it represents an arithmetic sequence, we calculate the common difference between the y-coordinates

d = 8 - 4 = 4

d = 16 - 8 = 8

d = 32 - 16 = 16

The calculated differences are not the same;

This means that, the model is not arithmetic

To check if it represents a geometric sequence, we calculate the ratio between the y-coordinates

r = \frac 84 = 2

r = \frac{16}8 = 2

r = \frac{32}{16} = 2

The calculated ratios are the same;

This means that, the model is geometric

<u>(b) The recursive function</u>

The sequence is given as: (x,y) = \{(1,4),(2,8),(3,16),(4,32)\}

Where:

T_1 = 4

T_2 = 8

T_3 = 16

T_4 = 32

Rewrite as:

T_1 = 4

T_2 = 2 \times 4

T_3 = 2 \times 8

T_4 = 2 \times 16

Substitute T_3 = 16 in T_4 = 2 \times 16

T_4 = 2 \times T_3

Express 3 as 4 - 1

T_4 = 2 \times T_{4-1

Represent 4 as n

T_n = 2 \times T_{n-1

Hence, the recursive sequence is:

T_n = 2 T_{n-1

<u>(c) The explicit formula</u>

In (a), we have:

r =2

T_1 = 4

The nth term of a geometric sequence is:

T_n = T_1 \times r^{n-1}

So, we have:

T_n = 4\times 2^{n-1}

Express 4 as 2^2

T_n = 2^2\times 2^{n-1}

Apply law of indices

T_n = 2^{2+ n-1}

T_n = 2^{2-1+ n}

T_n = 2^{1+ n}

So, the time to complete the 8th station is:

T_8 = 2^{1+ 8}

T_8 = 2^{9

T_8 = 512

Hence, she will complete the 8th station in 512 minutes

Read more about geometric sequence at:

brainly.com/question/11266123

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