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NNADVOKAT [17]
3 years ago
14

Dan had 78 dollars to spend on 7 books. After buying them he had 15 dollars. How much did each book cost?

Mathematics
2 answers:
andrezito [222]3 years ago
8 0
78-7x=15
-7x=-63
X=9
Each book costs $9
gladu [14]3 years ago
7 0
I think each book cost $9
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Solving Quadratic Equations using the Square Root Property
Afina-wow [57]

Answer:

x = -2   or   x = -5

Step-by-step explanation:

You need to complete the square before you can take the square root of both sides.

x^2 + 7x + 10 = 0

Subtract 10 from both sides.

x^2 + 7x = -10

To complete the square, you need to add the square of half of the x-term coefficient to both sides.

The x-term coefficient is 7. Half of that is 7/2. Square it to get 49/4. Now we add 49/4 to both sides of the equation.

x^2 + 7x + \dfrac{49}{4} = -10 + \dfrac{49}{4}

(x + \dfrac{7}{2})^2 = -\dfrac{40}{4} + \dfrac{49}{4}

(x + \dfrac{7}{2})^2 = \dfrac{9}{4}

Now we use the square root property, if

x^2 = k, then

x = \pm \sqrt{k}

x + \dfrac{7}{2} = \pm \sqrt{\dfrac{9}{4}}

x + \dfrac{7}{2} = \pm \dfrac{3}{2}

x + \dfrac{7}{2} = \dfrac{3}{2}   or   x + \dfrac{7}{2} = -\dfrac{3}{2}

x = -\dfrac{4}{2}   or   x = -\dfrac{10}{2}

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5 0
3 years ago
The value of 5 nickels is <br> % of the value of a dollar.
Taya2010 [7]

The correct answer is 25 percent

5 0
3 years ago
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2 times 10 to the 4th subtracted to 7 to the 3ed
alekssr [168]

2 x 10 4th power - 7 3rd power

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I think this is the answer to your problem.  Hope this helped!

-TTL

6 0
3 years ago
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Tresset [83]

Answer:

First option is the correct choice.

Step-by-step explanation:

y - 6 = 1/5 x + 0

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Best Regards!

8 0
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Klio2033 [76]

Answer:

Please check explanation

Step-by-step explanation:

Here, we want to do a matching.

We shall be matching the given statements with the features we have on the graph

Hence we shall be looking closely at the graph to answer the questions.

The y-intercept is the point at which the graph touches the y-axis

And it was at -3 degrees celsius at the beginning of the day.

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We can see that the graph rose from 8am before it finally comes to zero at 8pm

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While temperature was lowest at 2am, we can see a peak at 2pm.

8 0
3 years ago
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