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erastovalidia [21]
4 years ago
10

Simplify using order of operations: 2(5 – 8) x 42.

Mathematics
2 answers:
Katen [24]4 years ago
8 0
Hey there, 

Lets solve this equation step by step, 

First, <span>Simplify </span><span>5−8 </span><span>to </span><span>−3 

</span>2*-3x^4^2 

 Simplify, 

-2*3x^4^2 

Simplify <span>2×3<span>x^42</span></span><span> to </span><span>6<span>x^<span>42 

</span></span></span>-6x^4^2 

GaryK [48]4 years ago
5 0
To solve, we will use PEMDAS.
Parenthesis first: 2(-3) x 42
There are no exponents
Multiply 2 by -3: -6 x 42
Multiply -6 by 42: -252
Your answer is -252. Remember to always use PEMDAS!
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95ft hope this helps
8 0
3 years ago
Solving for matrices
muminat

Answer:

D

Step-by-step explanation:

The augmented matrix for the system of three equaitons is

\left(\begin{array}{ccccc} 3&-4&-5&|&-27\\5&2&-2&|&11\\5&-4&4&|&-7\end{array}\right)

Multiply the first row by 5, the second row by -3 and add these two rows:

\left(\begin{array}{ccccc} 3&-4&-5&|&-27\\0&-26&-19&|&-168\\5&-4&4&|&-7\end{array}\right)

Subtract the third row from the second:

\left(\begin{array}{ccccc} 3&-4&-5&|&-27\\0&-26&-19&|&-168\\0&6&-6&|&18\end{array}\right)

Divide the third row by 6:

\left(\begin{array}{ccccc} 3&-4&-5&|&-27\\0&-26&-19&|&-168\\0&1&-1&|&3\end{array}\right)

Now multiply  the third equation by 26 and add it to the second row:

\left(\begin{array}{ccccc} 3&-4&-5&|&-27\\0&-26&-19&|&-168\\0&0&-45&|&-90\end{array}\right)

You get the system of three equations:

\left\{\begin{array}{r}3x-4y-5z=-27\\-26y-19z=-168\\-45z=-90\end{array}\right.

From the third equation

z=\dfrac{90}{45}=2.

Substitute z=2 into the second equation:

-26y-19\cdot 2=-168\\ \\-26y-38=-168\\ \\-26y=-168+38=-130\\ \\y=\dfrac{130}{26}=5.

Now substitute z=2 and y=5 into the first equation:

3x-4\cdot 5-5\cdot 2=-27\\ \\3x-20-10=-27\\ \\3x-30=-27\\ \\3x=-27+30=3\\ \\x=1.

The solution is (1,5,2)

4 0
3 years ago
Pls help your going to help my dead soulll
deff fn [24]
0.875 seconds
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4 0
3 years ago
Subtract. –21 – (–13)<br> a. –34<br> b. –8<br> c. 8<br> d. 34
Angelina_Jolie [31]
-21 - (-13)

-21 + 13

= -8

The answer B)

6 0
4 years ago
What is the percent of change from 75 to 14 rounded to nearest percent??
zhuklara [117]

- 81 %

Step-by-step explanation:

To find the percentage change;

([Current – Initial] / Initial) * 100

([14 - 75] / 75) * 100

(-61 / 75) * 100

(-0.81333) * 100

= - 81.3333 %

To the nearest percentage;

=  - 81 %

Learn More:

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3 0
3 years ago
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