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ANTONII [103]
2 years ago
12

Please someone I need the right answer will give brainiest if right​

Mathematics
2 answers:
nika2105 [10]2 years ago
8 0

Answer:

C. Because (-3)^2 is NOT equal to -9

Step-by-step explanation:

zvonat [6]2 years ago
8 0

Answer:

C

Step-by-step explanation:

√-9 is   3i.

Since there is a negative in the root, you can't have a regular number as the answer.

It askes why -3 is not the answer. Because -3 squared is 9, not -9.  

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PLEASE HELP
laila [671]
<h3><u>Option A</u></h3>

4 x^{2}+32 x-80=0 is the required equation to calculate width of rectangular frame that has a total area of 140 square inches.

<h3><u>Solution:</u></h3>

Given that,

Length of a rectangular frame is given as 2x + 10

Width of the rectangular frame is given as 2x + 6

Total area = 140 square inches

<em><u>The area of rectangular frame is given as:</u></em>

\text {area of rectangle}=\text {length } \times \text {width}

Plugging in values, we get

\begin{array}{l}{(2 x+10)(2 x+6)=140} \\\\ {4 x^{2}+12 x+20 x=80} \\\\ {4 x^{2}+32 x-80=0}\end{array}

This is the required equation to calculate width of rectangular frame

Solve the above quadratic equation to get the value of "x"

4 x^{2}+32 x-80=0

<em><u>Use the quadratic equation formula:</u></em>

x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}

Here a = 4 ; b = 32 ; c = -80

x=\frac{-32 \pm \sqrt{32^{2}-4(4)(-80)}}{2(4)}

x=\frac{-32 \pm \sqrt{2304}}{8}

x = 2 or x = -10

Now measurement cannot be negative, so taking the positve value of "x", we can calculate the width

So put "x" = 2

Width of the rectangular frame = 2x + 6 = 2(2) + 6 = 10

Thus the width of frame is 10 inches

4 0
3 years ago
Help is very much needed !
vichka [17]

Answer:

1600

Step-by-step explanation:

<h3>(-2)^{4}  x (-10)^{2}[/tex]</h3><h3></h3><h3>Evaluate it: 2^{4} x -10^{2}</h3><h3>Multiply: 16x100</h3><h3>Finally you get:</h3><h3>1600</h3>
5 0
3 years ago
Read 2 more answers
Calculate the area of each parallelogram in square centimeters I’m in a question it’s a shape where your supposed to count to 5
kow [346]

Answer:

5 1/2

Step-by-step explanation:

8 0
2 years ago
What is the measure of an exterior angle in a regular 14-gon?
Sergeu [11.5K]

Answer:

21.715 degrees

Step-by-step explanation:

There are 14 vertexes (vertices) for a 14-gon. It is 'regular' so all these angles are equal. So the exterior angle of each is 180-154.285 = 21.715 degrees.

6 0
2 years ago
P+1.6÷(-0.4)=-12 what is the equation
Alexus [3.1K]

Answer: p = -8.

Step-by-step explanation: Since [tex]1.6/(-0.4) = -4[\tex],

[tex] p + \frac{1.6}{-0.4} = -12  [\tex]

[tex] p -4 = -12  [\tex]

[tex] p  = -12 + 4  [\tex]

[tex] p  = -8  [\tex]

5 0
3 years ago
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