1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ipatiy [6.2K]
2 years ago
12

If a polygon has 189 diagonals how many sides does the polygon have ?

Mathematics
2 answers:
Damm [24]2 years ago
7 0
N(n-3)/2=189
n(n-3)=378
n^2-3n-378=0
n=21
Natali [406]2 years ago
5 0
<span>(n take 2) minus n = 189 
n(n-3)/2 = 189 
n(n-3) = 378 
n^2-3n-378 = 0 
n=21

</span>
You might be interested in
The number of members over time in an online music sharing club can be modeled by an exponential function. the club started with
Paraphin [41]

Answer:

a.) N(x) =  N_{0} e^{bx}

b.) therefore b = \ln \frac{2142}{2100}  =  \ln (1.02) = 0.0198

    b is the rate of increase of number of members

c.) The club will not be able to get more than 5000 members during its first year.

Step-by-step explanation:

i) the club started with 2100 members.

  so we can write N_{0} = 2100.

a.) so we can write the equation as an exponential function given by

  N(x) =  N_{0} e^{bx} where x is in months and b is a constant and N(x) is the number of members in the online music sharing club .

 therefore 2142 = 2100 \times (e^{b\times 1}) = 2100e^{b}

b.) therefore b = \ln \frac{2142}{2100}  =  \ln (1.02) = 0.0198

    b is the rate of increase of number of members

c.) Will the club have more than 5000 members during its first year? Justify your reasoning.

      5000 = 2100e^{0.0198x}

 therefore x  = \frac{1}{0.0198} \ln{(\frac{5000}{2100} )}  =  43.81 \hspace{0.1cm}months

The club will not be able to get more than 5000 members during its first year.

7 0
2 years ago
This is super confusing plz help???
netineya [11]

Answer:

None. She gave half to one person then the other half to another person.

Step-by-step explanation:

Hope this is correct, if not feel free to let me know. I'm sorry in advance if this is wrong.

4 0
2 years ago
Read 2 more answers
Help please :( points !
mars1129 [50]
Answer: 2/5

Explanation: 10+8+12 = 30 12/30 = .4 .4 = 2/5
4 0
3 years ago
Read 2 more answers
Pleaseeeeee help I’m so confused
SSSSS [86.1K]

Answer:

4747

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Need answers ASAP pls!!
dezoksy [38]

Answer:

<em>Good Luck!</em>

Step-by-step explanation:

7 0
2 years ago
Other questions:
  • PLEASE JUST CHECK IT OUT AND TRY YOUR BEST TO ANSWER. I WILL DEFINITELY AWARD BRAINLIEST :)
    15·1 answer
  • Pls help me
    13·2 answers
  • How do you rewrite the equation in the form 52m = 460
    5·1 answer
  • Carolos is baking bread and uses 3/8 cup of sugar in one load and is making 6 loafs so how much sugar die he use:
    14·1 answer
  • An automobile insurance company divides customers into three categories: good risks, medium risks, and poor risks. Assume that o
    7·1 answer
  • 3a/(a+1)^2 Give the equivalent numerator if the denominator is (a+1)^3
    13·1 answer
  • in a 30-60-90 triangle, the length of the side opposite the 30 angle is 8. find the length of the side opposite the 60 angle
    15·1 answer
  • A soft drink costs $1.65, and each refill for the drink costs $0.95. If you have $4.50, how many refills can you purchase?
    5·2 answers
  • Common Core Sheets
    12·2 answers
  • K + 5 - 4v + 12 k = 12 and v=6<br>_<br>v
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!