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Verdich [7]
3 years ago
13

Which of the following can be added without altering any of the fractions?

Mathematics
1 answer:
Murrr4er [49]3 years ago
4 0
<h3>Answer: Choice A</h3>

Why? Because the denominators are both the same at 2x+8. We can only add or subtract fractions when the denominators are the same. The general rule for adding fractions is

\frac{A}{C}+\frac{B}{C} = \frac{A+B}{C}

We have numerators A and B added together over a common denominator C. If we didn't have a common denominator, then we'd have to do a bit of algebraic manipulation to get both fractions to a common denominator. It doesn't have to be the lowest common denominator (LCD), though it's often more efficient that way.

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A pecan pie is being served for dessert. One piece of pie has an arc length of 7.85 in. It has been cut into 8 equal pieces. Wha
grin007 [14]

Answer:

The radius of the pie is 6.17 in.

Step-by-step explanation:

The formula for arc length as a function of radius is

s = r·Ф, where Ф is the central angle in radians.

Here we know that the arc length is 7.85 in.  Assuming that the whole pie has been cut into 8 equal pieces, the central angle of one such piece is

2π / 8, or π /4 (radians).

thus, s = r·Ф, solved for r, is r = s/Ф

and in this instance r = (7.85 in)/(π/4).  Evaluating this, we get:

                                 r = 6.17 in

The radius of the pie is 6.17 in.

8 0
3 years ago
How do I factor x^4-5x^2+6?
Vilka [71]

Answer:

=(x^2-3)(x^2-2)

Step-by-step explanation:

So we have the expression:

x^4-5x^2+6

And we wish to factor it.

First, let's make a substitution. Let's let u be equal to x². Therefore, our expression is now:

=u^2-5u+6

This is a technique called quadratic u-substitution. Now, we can factor in this form.

We can use the numbers -3 and -2. So:

=u^2-2u-3u+6

For the first two terms, factor out a u.

For the last two terms, factor out a -3. So:

=u(u-2)-3(u-2)

Grouping:

=(u-3)(u-2)

Now, substitute back the x² for u:

=(x^2-3)(x^2-2)

And this is the simplest form.

And we're done!

3 0
3 years ago
7/8*16/21<br><br> i need help
Pavlova-9 [17]

Answer:

\frac{7}{8}   \times  \frac{16}{21}  =  \frac{2}{3}

Step-by-step explanation:

this is the answer.hope this helps you

6 0
3 years ago
Read 2 more answers
PLEASE HELP ANYONE.....
irga5000 [103]

Answer:

the awnser should have is. b

8 0
2 years ago
Read 2 more answers
Plz help me with this assignment! I need help asap!
Sophie [7]

Answer:

3). 1.21

4). 0.57

Step-by-step explanation:

Quarter = 25 cents

Nickel = 5 cents

Penny = 1 cent

3 0
2 years ago
Read 2 more answers
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