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taurus [48]
3 years ago
10

Does 3.9 x 6.12 equal 238.68.

Mathematics
1 answer:
STatiana [176]3 years ago
3 0
23.868 but thats close one dp. off
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Please help me. I need help
mel-nik [20]
<h3>Answer:</h3>

  a.  -(3√13)/13

<h3>Step-by-step explanation:</h3>

The cosine can be found from the tangent by way of the secant.

  tan(θ)² +1 = sec(θ)² = 1/cos(θ)²

Then ...

  cos(θ) = ±1/√(tan(θ)² +1)

The <em>cosine is negative in the second quadrant</em>, so we will choose that sign.

  cos(θ) = -1/√((-2/3)² +1) = -1/√(4/9 +1) = -1/√(13/9)

  cos(θ) = -3/√13 = -(3√13)/13 . . . . . matches your selection A

3 0
3 years ago
Read 2 more answers
Factor and solves the polynomial <br> x(to the 2nd power) + 5x + 4 = 0<br> x= (blank) and x= (blank)
zubka84 [21]

Answer:

x = -4~ \text{and}~ x = -1

Step-by-step explanation:

~~~~~~~x^2 +5x +4  =0\\\\\implies x^2 +4x +x  +4 = 0\\\\\implies x(x+4) +(x+4) = 0\\\\\implies (x+4)(x+1) = 0\\\\\implies x = -4,~~ x = -1

3 0
1 year ago
A square pyramid is shown. What is the surface area?
Blizzard [7]

Answer:

  • C. 31.25 cm²

Step-by-step explanation:

<u>Surface area comprises of:</u>

  • A = Area of square base + 4(area of triangle faces)
  • A = 2.5² + 4*1/2*2.5*5= 31.25 cm²

Correct option is C

4 0
2 years ago
Read 2 more answers
If you’re good at math and know the answer please help!!
dangina [55]

Answer:

The fisrt net, a, has a surface are of 160 inches

Step-by-step explanation:

10 / 2 = 5

5 * 3 = 15

15 * 4 = 60

10 * 10 = 100

100 + 60 = <u>160 inches</u>

<u></u>

<u></u>

Hope this helped! Have a nice day, and feel free to follow me on insta (leo_g_rios)

-XxDeathshotxX

3 0
3 years ago
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-(-3/2x + 3) + 1 &gt; 2x + 5/2
damaskus [11]
There is your answer

Mark brainliest please

7 0
2 years ago
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