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Tpy6a [65]
1 year ago
15

A = 8, b = 4, and c = 16

Mathematics
2 answers:
horsena [70]1 year ago
5 0
<h3>Answer: \sf 3\dfrac{4}{31} \quad or \quad \dfrac{97}{31}</h3>

-------------------------------------------------------------------------------------------------------

The given expression:

\sf \dfrac{2b + 3c^2}{4a^2 - 2b}

Here given <u>a = 8</u>, <u>b = 4</u>, and <u>c = 16</u>

<u />

Inserting this values

\sf \dfrac{2(4) + 3(16)^2}{4(8)^2 - 2(4)}

Simplify following

\sf \dfrac{8 + 3(256)}{4(64) - 8}

Distribute inside parenthesis

\sf \dfrac{8 + 768}{256 - 8}

Add/Subtract similar terms

\sf \dfrac{776}{248}

Simplify following, in improper fraction

\sf \dfrac{97}{31}

In mixed fraction, answer:

\sf 3\dfrac{4}{31}

Vsevolod [243]1 year ago
4 0

Answer:

3 \frac{4}{31}

Step-by-step explanation:

\frac{2(4) + 3(16) {}^{2} }{4(8) {}^{2} - 2(4) }

\frac{776}{248}

3 \frac{4}{31}

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When multiplying exponents do you add them.
Masja [62]
Add the exponents if the bases are the same, multiply the bases if the exponents are the same, if nothing is the same just solve it.
5 0
2 years ago
How do you find the tax on a purchase and calculate the final bill? Give an example, then write and solve a number sentence to i
Lerok [7]
If you are buying something that cost $15 and sale tax is 6%, you can calculate final bill trough proportions:
$15:100%=$x:106%
100x=106*15, x=(106*15)/100, x=$15.9  is final bill.

You can also use easier way: $15+0.06*$15=$15.9
Explanation for 2nd way: Cost is $15, on that you need to add 6% of $15: (6%/100%)*$15 and that is 0.06*15.
7 0
3 years ago
Solve for x. 3^x−1=9^x+2 <br> Enter your answer in the box.
slava [35]

Answer:

-5 =x

Step-by-step explanation:

3^(x-1) = 9^(x+2)

Replace 9 with 3^2

3^(x-1) = 3^2^(x+2)

We know that a power to a power means the powers are multiplied

a^b^c = a^(b*c)

3^(x-1) = 3^(2x+2)

When the bases are the same, the powers have to be the same

x-1 = 2x+4

Subtract x from each side

x-x-1 =2x-x+4

-1 =x+4

Subtract 4 from each side

-1-4 =x+4-4

-1-4 = x

-5 =x

4 0
3 years ago
Bill found a book he wanted on sale for $20.80. The original price of the book was $32. Find the discount rate.
Maurinko [17]

Answer:

35% discount

Step-by-step explanation:

We can first find what percent of 32 20.80 is.

This can be shown by using a percent proportion.

\frac{20.80}{32} = \frac{x}{100}

We can cross multiply to find the value of x.

20.80\cdot100=2080\\\\2080\div 32 = 65

So 20.80 is 65% of 32.

However, this is the percent of the original price. To find the discount, we have to subtract 65 from 100.

100 - 65 = 35

So the book was on a 35% discount.

Hope this helped!

3 0
3 years ago
4x+4y=-20 and -3x-12y=-60
klasskru [66]

Answer:

(0,-5)

Step-by-step explanation:

3(4x+4y=20)

-3x-12y=-60

12x+12y=60

-3x-12y=-60

9x=0

x=0

4(0)+4y=-20

4y=-20

y=-5

5 0
3 years ago
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