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Lemur [1.5K]
3 years ago
8

Question 1: Describe how you would use the distributive property to simplify (39 x 5). Question 2: Your best friend tells you th

e solution of 375 = x - 28 is 347. Explain your best friend's error.
Mathematics
1 answer:
Alexxx [7]3 years ago
6 0
39 x 5 = (30 x 5) + (9 x 5) = 150 + 45 = 195



He did not change the sign of operation when 28 crossed the equals sign.
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What are vertices of the conic 16x² - 25y² = 400 ?
garri49 [273]

Answer:

(-5, 0) and (5, 0)

Step-by-step explanation:

This equation fits the form for a hyperbola with x-intercepts.  The standard form for such an equation is

\frac{x^2}{a^2}-\frac{y^2}{b^2}=1

To get the equation in the question into this standard form, divide each term by 400.

\frac{16x^2}{400}-\frac{25y^2}{400}=\frac{400}{400}\\\frac{x^2}{25}-\frac{y^2}{16}=1

To find the x-intercepts, make <em>y</em> = 0.

\frac{x^2}{25}=1\\x^2=25\\x=\pm 5

The vertices are located at the points (-5, 0) and (5, 0).

<em>Note: </em>There are no <em>y</em>-intercepts; making <em>x</em> = 0 produces no real solutions for <em>y</em>.

5 0
2 years ago
Look at the sequence given below.
posledela

Answer:

  C. -4n + 8

Step-by-step explanation:

Try the formulas and see which works.

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The common difference is -4, so the coefficient of n in the explicit formula is -4. Every term is divisible by 4, so there won't be 3 anywhere in the formula.

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-4·1 +8 = 4

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-4·3 +8 = -4

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The formula -4n+8 reproduces the sequence exactly.

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3 years ago
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The earth is about 2.5578*10'13 miles
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-6 ÷ -2 (-1 - 3)2 x -1
nexus9112 [7]

Answer:

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Step-by-step explanation:

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2 years ago
Read 2 more answers
Selectie correct answer.
denis-greek [22]

Answer:

OD.0

Step-by-step explanation:

because 2(X+4)-1 = 2x+7

or, 2x+8-1 = 2x+7

or, 2x+7= 2x+7

and it cancels out eachother so it will be 0

4 0
3 years ago
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