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liubo4ka [24]
3 years ago
15

What is f(5) for the function f(x)=2x+8?

Mathematics
2 answers:
xenn [34]3 years ago
8 0
F(x)= 2x+8
f(5)= 2(5)+8
f(5)= 10+8
f(5)= 18
STatiana [176]3 years ago
3 0
Just subtitute 5 as x in the equation given for f.
2(5)+8=18.
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Now, I think the first step they want you to write is:
8/3 (divided by) 19/6

When you divide two fractions, it's the same as multiplying the first fraction by the reciprocal of the second fraction. (A reciprocal is a fancy way of saying you flip the fraction)
So the next step will look like this:
8/3 x 6/19

With this setup, you can cross simplify the fractions so that they look like this:
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When you multiply this, you get 16/19
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4 years ago
A box contains 5 white and 7 black balls. Two successive drawn of 3 balls are made
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We consider 2 pairs or equations, for example (1, 2) and (2, 3), and eliminate one of the variables in each pair, creating a system of 2 linear equations with 2 unknowns. 

Note that the third equation contains -2y which can be used to eliminate easily -6y in the second equation, and -4y in the fourth.

i) consider equations 1 and 3:

-3x-4y-3z=-7
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multiply the second equation by -2:

-3x-4y-3z=-7
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adding the 2 equations we have -13x-13z=-25

ii) consider equations 2 and 3. Multiply the third equation by -3:

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Answer: the system has no solutions
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