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kolezko [41]
1 year ago
10

Can someone help me pls! I would appreciate it!!

Mathematics
1 answer:
Lena [83]1 year ago
8 0

  • Complementary angles add to 90 degrees.
  • Supplementary angles add to 180 degrees.
  • Vertical angles are equal.

So, the answers are (in degrees):

6) 47, 137, 43

7) 49, 131, 49

8) 18, 72, 18

9) 13, 77, 167

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Step-by-step explanation:

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Find the solution to the equation below.<br> 2x^2+3x-20=0
mariarad [96]

Answer:

  x = -4, 5/2

Step-by-step explanation:

A quadratic can be solved may ways, including graphing, factoring, and the quadratic formula. You can also check possible answers by making use of the relationships between solutions and the coefficients.

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A graph is attached. It shows the solutions to be -4 and 5/2.

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When factored, the equation becomes ...

  (2x -5)(x +4) = 0 . . . . . has solutions x=-4, x=5/2 (these make the factors zero)

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Using the quadratic formula, the solutions of ax^2 +bx +c = 0 are found from ...

  x = (-b±√(b²-4ac))/(2a)

  x = (-3±√(3²-4(2)(-20))/(2(2)) = (-3±√169)/4 = {-16, +10}/4

  x = {-4, 5/2}

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For ax^2 +bx +c = 0, the solutions must satisfy ...

  product of solutions is c/a = -20/2 = -10

Only the first and last choices have this product.

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8 0
3 years ago
4.
Reptile [31]

Answer:

c.) 7.5

Step-by-step explanation:

There is a part-to-whole relationship here.

2 customers : 8 minutes= ? customers : 30 minutes

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2/8=x/30

Cross multiply:

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Divided both sides by 8:

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I hope this helps!

8 0
3 years ago
The main show tank has a radius of 60 feet and forms a quarter sphere where the bottom of the pool is spherical and the top of t
svetlana [45]

The given radius is = 60 feet

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As quarter of anything is defined as its one-fourth part, so here the volume of the quarter of sphere can be calculated by finding one fourth of the calculated volume.

So volume of quarter sphere = \frac{902059.20}{4}

= 225514.80 cubic feet

And rounding this to nearest whole number we get 225515 cubic feet as the answer.


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3 years ago
What is the correct answer to the last box with a red x on it?
ahrayia [7]

Answer:

good question

did i ask shut man stop cheating

4 0
2 years ago
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