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Flashcards: Interpret statements that use function notation in terms of a context

Consider the scenario below:

Helen is a painter. It takes her 3 days to make each painting. She has already made 6 paintings. Which of the following functions best models the number of paintings she will have after days?

$f(x)=\frac{x}{3} +6$

f(x)=x-3

f(x)=3x

f(x)=3x+6

f(x)=6x^3

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Flashcards: Interpret statements that use function notation in terms of a context

Consider the scenario below:

Helen is a painter. It takes her 3 days to make each painting. She has already made 6 paintings. Which of the following functions best models the number of paintings she will have after days?

Your answer:

f(x)=x-3

Your answer:

f(x)=3x

Your answer:

f(x)=3x+6

Your answer:

f(x)=6x^3

Correct answer:

$f(x)=\frac{x}{3} +6$

Explanation:

The question asks, "Which of the following functions best models the number of paintings she will have after days?"

From this, you know that the variable represents the number of days, and that f(x) represents the number of paintings she makes as a function of days spent working.

If it takes 3 days to make a painting, each day results in $\frac{1}{3}$ paintings. Therefore, we have a linear relationship with slope $\frac{1}{3}$ .

Additionally, she begins with 6 paintings. Therefore, even when zero days are spent working on paintings, she will have 6 paintings. In other words, f(0)=6 . This means the y-intercept is 6.

As a result, the function will be

$f(x)=\frac{1}{3}x +6$

which can be rewritten as

$f(x)=\frac{x}{3} +6$

Flashcards: Interpret statements that use function notation in terms of a context

The daily pay in U.S. Dollars for a certain job is defined as the following function f(x) , where equals time in hours:

f(x) = 15x+10

If an employee works for 7 hours in a day, how much is he or she paid?

$\$70.00$

$\$85.00$

$\$25.00$

$\$105.00$

$\$115.00$

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Flashcards: Interpret statements that use function notation in terms of a context

If an employee works for 7 hours in a day, how much is he or she paid?

Your answer:

$\$70.00$

Your answer:

$\$85.00$

Your answer:

$\$25.00$

Your answer:

$\$105.00$

Correct answer:

$\$115.00$

Explanation:

The above function can be understood as, "An employee is paid $15 for each hour he or she works, plus a flat amount of $10."

If an employee works 7 hours, we can find the amount that he or she is paid by plugging in 7 for "Hours" in the equation:

Adhering to order of operations, we next find the product of 15 and 7:

Finally, we find the sum of 105 and 10:

The employee is paid $115.00 for seven hours' work.

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Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

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Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

Flashcards: Interpret statements that use function notation in terms of a context

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