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Sagot :
To determine Julie's commission, we need to compose the functions [tex]\( f \)[/tex] and [tex]\( g \)[/tex] given in the problem.
1. Identify the given functions:
[tex]\[ f(x) = 0.05x \][/tex]
This represents the commission rate of [tex]\( 5\% \)[/tex] on a certain sales amount.
[tex]\[ g(x) = x - 4000 \][/tex]
This function tells us how much of her sales exceed [tex]\( \$4000 \)[/tex].
2. Compose the functions [tex]\( f \)[/tex] and [tex]\( g \)[/tex] to find the commission function [tex]\( f(g(x)) \)[/tex]:
[tex]\[ f(g(x)) = f(x - 4000) \][/tex]
3. Substitute [tex]\( g(x) \)[/tex] into [tex]\( f(x) \)[/tex]:
[tex]\[ f(g(x)) = f(x - 4000) \][/tex]
We replace [tex]\( x \)[/tex] in [tex]\( f(x) \)[/tex] with [tex]\( g(x) \)[/tex]:
[tex]\[ f(x - 4000) = 0.05(x - 4000) \][/tex]
4. Simplify the expression:
[tex]\[ 0.05(x - 4000) = 0.05x - 0.05 \times 4000 \][/tex]
[tex]\[ = 0.05x - 200 \][/tex]
So, the function to determine Julie's commission is:
[tex]\[ f(g(x)) = 0.05x - 200 \][/tex]
Thus, the correct choice from the options given is:
[tex]\[ f(g(x)) = 0.05 x - 200 \][/tex]
1. Identify the given functions:
[tex]\[ f(x) = 0.05x \][/tex]
This represents the commission rate of [tex]\( 5\% \)[/tex] on a certain sales amount.
[tex]\[ g(x) = x - 4000 \][/tex]
This function tells us how much of her sales exceed [tex]\( \$4000 \)[/tex].
2. Compose the functions [tex]\( f \)[/tex] and [tex]\( g \)[/tex] to find the commission function [tex]\( f(g(x)) \)[/tex]:
[tex]\[ f(g(x)) = f(x - 4000) \][/tex]
3. Substitute [tex]\( g(x) \)[/tex] into [tex]\( f(x) \)[/tex]:
[tex]\[ f(g(x)) = f(x - 4000) \][/tex]
We replace [tex]\( x \)[/tex] in [tex]\( f(x) \)[/tex] with [tex]\( g(x) \)[/tex]:
[tex]\[ f(x - 4000) = 0.05(x - 4000) \][/tex]
4. Simplify the expression:
[tex]\[ 0.05(x - 4000) = 0.05x - 0.05 \times 4000 \][/tex]
[tex]\[ = 0.05x - 200 \][/tex]
So, the function to determine Julie's commission is:
[tex]\[ f(g(x)) = 0.05x - 200 \][/tex]
Thus, the correct choice from the options given is:
[tex]\[ f(g(x)) = 0.05 x - 200 \][/tex]
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