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Here are the data for the population [tex] f [/tex], in thousands, of a city [tex] d [/tex] decades after 1960, along with the graph of the function given by [tex] f(d) = 25 \times (1.19)^d [/tex]. Elena thinks that shifting the graph of [tex] f [/tex] up by 50 will match the data. Han thinks that shifting the graph of [tex] f [/tex] up by 60 and then right by 1 will match the data.

The function that defines Elena's graph is [tex] \square [/tex]

The function that defines Han's graph is [tex] \square [/tex]

Options:
- [tex] g(d) = 50 + 25 \times (1.19)^d [/tex]
- [tex] g(d) = 25 \times (1.19)^d - 50 [/tex]
- [tex] g(d) = 25 \times (1.19)^{d+30} [/tex]
- [tex] h(d) = 60 + 25 \times (1.19)^{d-1} [/tex]
- [tex] h(d) = 1 - 25 \times (1.19)^{d+60} [/tex]
- [tex] h(d) = 60 + 25 \times (1.19)^d [/tex]

Answer :

To find the functions that define the graphs after Elena and Han make their adjustments, let's break down what each of them is thinking:

1. Elena's Graph:

Elena wants to shift the graph of the original function [tex]\( f(d) = 25 \times (1.19)^d \)[/tex] up by 50 units.

- Shifting a graph up by a certain number involves adding that number to the function.
- So, to shift the graph of [tex]\( f \)[/tex] up by 50, you would add 50 to the original function.

Therefore, Elena's function becomes:
[tex]\[
g(d) = 50 + 25 \times (1.19)^d
\][/tex]

2. Han's Graph:

Han wants to shift the graph of the original function up by 60 units and then right by 1 unit.

- Shifting the graph up by 60 is similar to Elena's shift, where you add 60 to the function.
- Shifting a graph to the right by 1 unit involves adjusting the input [tex]\( d \)[/tex] by subtracting 1 from it. This means replacing [tex]\( d \)[/tex] with [tex]\( d - 1 \)[/tex] in the function.

Thus, Han's function becomes:
[tex]\[
h(d) = 60 + 25 \times (1.19)^{d-1}
\][/tex]

These transformations result in the functions as described, with [tex]\( g(d) = 50 + 25 \times (1.19)^d \)[/tex] for Elena's adjustments and [tex]\( h(d) = 60 + 25 \times (1.19)^{d-1} \)[/tex] for Han's adjustments.

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Rewritten by : Barada