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Natali [406]
3 years ago
5

Solve 2x^2-4x-18=0 by completing the square. round the solutions to the nearest hundredth

Mathematics
1 answer:
Lorico [155]3 years ago
4 0

Answer:

1-√10

1+√10

Step-by-step explanation:

  • 2x^2-4x-18=0
  • x^2-2x-9=0
  • x^2-2x+1-10=0
  • (x-1)^2-10=0
  • (x-1+√10)(x-1-√10)=0
  • x=1-√10
  • x=1+√10
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See in details.

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3 years ago
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A spinner is divided into 8 equal sections. Two of the sections are red, 3 are green, and 3 are blue. What is the probability of
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6 0
3 years ago
Can someone help? i have a test tomorrow and im really confused with this
monitta

Answer:

45°

Step-by-step explanation:

<u>The Supplementary Angles Postulate states that if two angles form a linear pair, then the sum of the angles is 180°.</u>

<u />

With this knowledge, you can set up your equation:

(3x+6)+(x+2)=180

<em>(It's okay that I didn't put the degrees in, you still get the same answer)</em>

<em>First, combine like terms.</em>

(<u>3x</u>+6)+(<u>x</u>+2)=180

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    -8    -8

4x=172

÷4   ÷4

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<em><u>DO NOT STOP HERE!! Since the question asks for the measure of angle SQR, do NOT put 43 as the answer!! It is a common mistake (I have fallen for it many times before!!)</u></em>

<em>Plug in the "x" into the equation.</em>

(43)+2=45°

<em><u /></em>

<em><u>Hope this helps! If you need more clarification, or if it isn't right, feel free to tell me in the comments. Rock that quiz tomorrow!!</u></em>

7 0
3 years ago
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Effectus [21]
We let k be the proportionality constant for the relationship between number of hours, h and speed of the walker, s. 

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Substituting the known values,
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For the second scenario,
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Substituting the calculated value for k and the given value for speed,
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Therefore, it will take 20 hours to walk with a speed of 3 miles per hour. 
7 0
3 years ago
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