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You've set a goal of having [tex]\$10,000[/tex] after 15 years. If you estimate that your investment account will have an average yearly growth factor of 1.09, which equation could be used to calculate how much you should invest today?

A. [tex]y = 10000(1.09)^5[/tex]

B. [tex]y = 10000(0.09)^{10}[/tex]

C. [tex]10000 = x(1.09)^{15}[/tex]

D. [tex]10000 = x(0.09)[/tex]

Answer :

We want to have \[tex]$10,000 after 15 years with an average yearly growth factor of 1.09. This means that if you invest an amount \$[/tex][tex]\(x\)[/tex] today, it will grow to

[tex]$$
x(1.09)^{15}
$$[/tex]

after 15 years. Since you want this amount to be \[tex]$10,000, we set up the equation

$[/tex][tex]$
10000 = x(1.09)^{15}.
$[/tex][tex]$

This is the equation that shows the relationship between the present investment \$[/tex][tex]\(x\)[/tex] and the future amount.

To find out how much to invest today, solve for \[tex]$\(x\) by dividing both sides of the equation by \((1.09)^{15}\):

$[/tex][tex]$
x = \frac{10000}{(1.09)^{15}}.
$[/tex][tex]$

Evaluating this expression gives approximately \$[/tex]2745.38.

Among the provided multiple-choice options:

a. [tex]\(y = 10000(1.09)^5\)[/tex]
b. [tex]\(y = 10000(0.09)^{10}\)[/tex]
c. [tex]\(10000 = x(1.09)^{15}\)[/tex]
d. [tex]\(10000 = x(0.09)\)[/tex],

option c is the one that correctly represents the relationship, so the correct answer corresponds to option c.

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