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diamong [38]
4 years ago
5

7n + 8 + 1= -19 How do you solve this

Mathematics
2 answers:
Alona [7]4 years ago
5 0

Answer:

-4

Step-by-step explanation:

firt you add a minus one on both sides:

7n + 8 + 1 + (- 1) = -19 + (- 1) => 7n + 8 = -20

then add a minus eight on both sides:

7n + 8 + (- 8) = -20 + (- 8) => 7n = -28

finally in order to find (n) , devide both sides by seven:

7n ÷ 7 = (- 28) ÷ 7 => [ n = -4 ]

Mila [183]4 years ago
3 0

Answer:

hope it helps

plz mark brainliest

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Determine the period of this Function.
marysya [2.9K]

Answer:

4p

Step-by-step explanation:

The period is basically the difference in x from one "peak" to the other "peak".

The peaks are the highest points of a sinosodial function, and the figure them out, use the formula:

|peak_1-peak_2|=period

We know the first peak is at about x=0\pi

We know the second peak is at about x=4\pi

So plugging this in:

|0-4\pi |=4\pi

So the period is 4\pi

I am assuming "p" stands for \pi, so the answer should be 4p.

There are other ways to find the period, for instance if you are given a sinusodial function in writing instead of a graph.

Here is an example:

5sin(5x+2)+3

If we want to find period, we need to find what we call "b"

b is the number in front of x, which we can identify as bx, which in this case is 5x above.

Now what do we do with this "b"?

This is the value we need to find our period.

If you know b, you can use this formula to find the period:

\frac{2\pi }{b}=p

And when we plug in b:

\frac{2\pi }{5}

=

1.257, which would be your period.

THis can also be reworked so that you can find b:

If the formula for period is \frac{2\pi }{b}=p, then the opposite formula would be \frac{2\pi }{ p}=b

And when you plug the period you have in:

\frac{2\pi }{1.257}

=

5

Anyway, your answer is 4p.

Hope this helps!

3 0
3 years ago
3x=4(c-d)/d make d the subject
MissTica

Answer:

d =  \frac{4c}{3x + 4}

Step-by-step explanation:

3x =  \frac{4(c - d)}{d}

Multiply both sides by d:

3xd = 4(c  - d)

Expand:

3xd = 4c \:  - 4d

+4d on both sides:

3xd + 4d = 4c

Factorise d out of the left-hand side:

d(3x + 4) = 4c

Divide both sides by (3x +4):

d =  \frac{4c}{3x + 4}

8 0
3 years ago
For his phone service, Jonh pays a monthly fee of $30, and he pays and additional $0.05 per minute of use. the least he has been
REY [17]
$99.45-$30= $69.45

$69.45/.05= 1,389

He's been using his phone for 1,389 minutes.

0.05m + 30= $99.45
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3 years ago
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3 years ago
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