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Rainbow [258]
3 years ago
8

How do I solve this problem

Mathematics
1 answer:
Harlamova29_29 [7]3 years ago
6 0

Answer:

<h2>SA = 166 cm²</h2>

Step-by-step explanation:

We have three pairs of rectangles:

4cm × 5cm

4cm × 7cm

5cm × 7cm

The formula of an area of a rectangle l × w:

A = l × w

l - length

w - width

Substitute:

A₁ = (4)(5) = 20 cm²

A₂ = (4)(7) = 28 cm²

A₃ = (5)(7) = 35 cm²

The Surface Area:

SA = 2A₁ + 2A₂ + 2A₃

Substitute:

SA = 2(20) + 2(28) + 2(35) = 40 + 56 + 70 = 166 cm²

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<span>A polygon is classified by how many ____angles_______ it has.</span>
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3 years ago
Read 2 more answers
21 times 50=? will mark brainliest
elena-14-01-66 [18.8K]

<em>Answer,</em>

<em>21 * 50 = </em><em>1,050</em>

<em>Explanation Down Below,</em>



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3 years ago
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What are the roots of the equation 9x^2 + 54x +82 = 0 in simplest a + bi form?​
s344n2d4d5 [400]

Answer:

The roots are

<h3>x =  - 3 +  \frac{1}{3}  i \:  \:  \: or \:  \:  \: x =  - 3 -  \frac{1}{3} i \\</h3>

Step-by-step explanation:

9x² + 54x + 82 = 0

Using the quadratic formula

That's

<h3>x =  \frac{ - b\pm \sqrt{ {b}^{2}  - 4ac} }{2a}</h3>

From the question

a = 9 , b = 54 , c = 82

Substitute the values into the above formula and solve

That's

<h3>x =  \frac{ - 54\pm \sqrt{ {54}^{2}  - 4(9)(82)} }{2(9)}  \\ x =  \frac{ - 54\pm \sqrt{2916 - 2952} }{18}  \\ x =  \frac{ - 54\pm \sqrt{ - 36} }{18}  \\ x =  \frac{ - 54\pm 6i}{18}</h3>

Separate the real and imaginary parts

That's

<h3>x =  -  \frac{54}{18} \pm \frac{6}{18}  \: i \\ x =  - 3\pm \frac{1}{3} i</h3>

We have the final answer as

<h3>x =  - 3 +  \frac{1}{3}  i \:  \:  \: or \:  \:  \: x =  - 3 -  \frac{1}{3} i \\</h3>

Hope this helps you

5 0
3 years ago
1. Bailey withdrew $135 from her checking account. Write an algebraic expression that describes Bailey's action.
MArishka [77]

<u><em>Answer:</em></u>

c − 135

<u><em>Explanation: </em></u>

Let's say that the amount of money in Bailey's checking account is  

c  dollars.

We also know that she took away  $ 135

From this variable and number, we can state the algebraic expression

 c − 135

<h2><u><em>Hope this helps!</em></u></h2>

<u><em></em></u>

7 0
3 years ago
How many license plates can be made which have the form ##LLL (2 numbers followed by 3 letters with repetition allowed) ?
Elden [556K]
Number of wars two numbers can be formed with repetition allowed = 10^2 = 100 ways.
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option a is the correct answer.
7 0
3 years ago
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