If f(x) varies directly with x, and f(x) = 45 when x = 9, find the value of f(x) when x = 3.
A.
5
B.
9
C.
15
D.
27

f(x) varies directly with x, the equation is f(x) = kx where k is the constant. f(x) = 45 when x = 9, then k = f(x)/x = 45/9 = 5. The equation is f(x) = 5x. When x = 3, f(3) = 5(3) = 15

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Question

Asked 5/30/2014 9:42:04 AM

Updated 6/11/2014 5:10:10 AM

1 Answer/Comment

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f(x) varies directly with x, the equation is f(x) = kx where k is the constant. f(x) = 45 when x = 9, then k = f(x)/x = 45/9 = 5.

The equation is f(x) = 5x.

When x = 3, f(3) = 5(3) = 15

The equation is f(x) = 5x.

When x = 3, f(3) = 5(3) = 15

Added 6/11/2014 5:10:10 AM

This answer has been confirmed as correct and helpful.

Which word correctly completes the sentence?
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Updated 3/29/2015 6:50:30 AM

1 Answer/Comment

Which word correctly completes the sentence?
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Question

Not Answered

Updated 5/28/2014 2:41:48 PM

2 Answers/Comments

My boss' office has big windows with a great view of the city.

Added 5/28/2014 9:20:01 AM

This answer has been flagged as incorrect.

The word which correctly completes the sentence is "boss's". My BOSS'S office has big windows with a great view of the city.

Added 5/28/2014 2:41:48 PM

This answer has been confirmed as correct and helpful.

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Question

Updated 10/25/2017 8:22:35 AM

1 Answer/Comment

At the women's salon, haircuts are half-price this weekend.

Added 10/25/2017 8:22:35 AM

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Which word correctly completes the sentence?
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1 Answer/Comment

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B.
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C.
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Question

Not Answered

Updated 5/28/2014 11:05:44 AM

1 Answer/Comment

The correct sentence is: The babies' faces are adorable.

Added 5/28/2014 11:05:44 AM

This answer has been confirmed as correct and helpful.

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