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azamat
2 years ago
7

Kira purchased n notebooks. They were 4 dollars each. Write an equation to represent the total cost c that Kira paid.

Mathematics
2 answers:
Anna [14]2 years ago
8 0
I believe C=4n is the answer
Verdich [7]2 years ago
7 0
4n=c because if you new how many books Kira bought you would multiply that by the cost of one notebook, $4*notebook(s), which would then equal the cost.
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Find all the zeros of <br><img src="https://tex.z-dn.net/?f=f%28x%29%20%3D%20%20%7B6x%7D%5E%7B4%7D%20%20%20-%20%20%7B7x%7D%5E%7B
Svetradugi [14.3K]

Answer:

  {-1, 1/2, 2/3, 1}

Step-by-step explanation:

I find a graphing calculator to be a most useful tool for problems like this. (See attached.)

_____

First of all, observe that the constant is -2, so 0 is not a zero.

It is often useful to look at the sum of coefficients. Here, that is 0, indicating 1 is a zero.

You can divide that out, or simply continue by looking at the sum of coefficients with odd-degree terms negated. Then you have 6 +7 -4 -7 -2 = 0, indicating -1 is also a zero.

__

At this point, it can be useful to divide out the factors you know. The synthetic division tableaus attached show that work. First is division by (x+1), then by (x -1).

The result of doing that is the quadratic ...

  6x^2 -7x +2 = 0

This can be factored ...

  (6x^2 -3x) -(4x -2) = 0 . . . . . . rewrite -7x and group term pairs

  3x(2x -1) -2(2x -1) = 0 . . . . . . . factor each pair

  (3x -2)(2x -1) = 0 . . . . . . the factorization of the remaining quadratic

The zeros of this are the values of x that make the factors zero: 2/3 and 1/2.

The zeros of the given function f(x) are x ∈ {-1, 1/2, 2/3, 1}.

5 0
2 years ago
Ok I’m actually dumb lol help me please.
mezya [45]

Answer:

x =20

Step-by-step explanation:

As a line is 180 degrees

So 7x + 40 would be 180, which would lead us with the equation:

7x+40=180

=7x =140 (minus both sides by 40)

=x =20 (divide both sides by 7)

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3 years ago
What does the word "of" mean? <br>A. in addition to<br>B. multiply by<br>C. divided by​
Natali [406]

Answer:

B. multiply by

5 0
2 years ago
ANSWER ASAP
Gnesinka [82]
(m=n) means that the greatest common denominator of m and n is 0.
this is a whole number.
this is a integer.
this is not a rational or irrational.
if this is the wrong answer please notify me. thank you!
6 0
2 years ago
The linear function in the graph shows the population of Greeville in the years since 2010.
labwork [276]
<span>approximately 2000 less than is your answer.</span>
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3 years ago
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