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Black_prince [1.1K]
3 years ago
10

Check me please ( brainlyest answer )

Mathematics
2 answers:
Tpy6a [65]3 years ago
6 0
Here are the answers:
1.  6+1+2+4+4+5=22.

Correct

2. 1 cm=5 ft. 6*5=30(2 times). 1*5=5. 2*5=10. 4*5=20(2 times). 

30+30+5+10+20+20=115.

Wrong.
drek231 [11]3 years ago
5 0
Your answer to the first one is incorrect.

We can cut the plan into two figures, a rectangle with side lengths of 4 cm and 5 cm and a rectangle with side lengths of 1 and 2 cm.

Perimeter of a Rectangle:

P = 2(l + w)

P = 2(4 + 5)

P = 2(9)

P = 18

Perimeter of a Rectangle:

P = 2(l + w)

P = 2(2 + 1)

P = 2(3)

P = 6

Add up the perimeters:

18 + 6 = 24

So the total perimeter is 24.

For the 2nd one, your answer is also incorrect.

We multiply 5 to the perimeter of the plans:

5 * 24 = 120

Not sure what the third one is asking.

For the fourth one we just multiply 'k' to the perimeter:

24 * k = 24k
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What are the roots of the quadratic equation x2+2x=-5
stiks02 [169]

Answer:

x = -1 +/-2i

Step-by-step explanation:

Write the equation in standard form to find the roots, also known as the solutions, zeros, or x-intercepts, of the quadratic.

x² + 2x + 5 = 0

Use the quadratic formula by substituting a= 1, b = 2 and c = 5.

x = \frac{-2 +/- \sqrt{(-2)^2 - 4(1)(5)} }{2(1)} = \frac{-2 +/-\sqrt{4 -20 } }{2} = \frac{-2 +/-\sqrt{-16 } }{2} = \frac{-2 +/-4i }{2} = -1 +/-2i

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3 years ago
(3x+14)° measurement in degrees a.20.00° b.40.25° c.42.50° d.74.00°​
Marysya12 [62]

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B

Step-by-step explanation:

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2 years ago
What is the surface area of the triangular prism
Harrizon [31]

Answer:

surface \: a = 9 \times 5 \\  =  45ft \times 2 \\  =   {90}^{2} ft\\ surface \: b =  \frac{1}{2} bh \\  =  \frac{1}{2 }  \times 6 \times 4 \\  = 3 \times 4 \\  = 12 \times 2 \\  =  {144}^{2} ft \\  =  90 + 144 \\  =  {234}^{2} ft

3 0
2 years ago
∠ R and∠ S are complementary. If m ∠ R = 12x - 3 and m ∠ S = 7x - 2, find m ∠ R.
Paha777 [63]

Step-by-step explanation:

<h2>Sum of two complementary angle is 90°</h2><h2 /><h2>so. </h2><h2><R+<S =90°</h2><h2>12x-3+7x-2=90°</h2><h2>19x-5=90°</h2><h2>19x=95°</h2><h2>X= 5</h2>

<h2><R= 60-3=57°</h2>
3 0
3 years ago
Solve the equation 4x^2-12x=7 algebraically for x.
ss7ja [257]
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                                      - 7  - 7
                       4x² - 12x - 7 = 0
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2x(2x) + 2x(1) - 7(2x) - 7(1) = 0
          2x(2x + 1) - 7(2x + 1) = 0
                    (2x - 7)(2x + 1) = 0
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           + 7 + 7                 - 1  - 1
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              2     2                  2      2
               x = 3¹/₂      or       x = ⁻¹/₂
7 0
3 years ago
Read 2 more answers
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