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pshichka [43]
3 years ago
10

explain why the arithmetic sequence: 1,14,27,40 contains many terms of the form 22222...22222 etc where only digit two appears.

How many 2's appear in the sequence? (The nth term rule is 13n-12)
Mathematics
2 answers:
vladimir2022 [97]3 years ago
4 0
The sequence of Bell numbers, 1, 2, 5, 15 ... by consideration of the integral factors of 10 and 12: 10 has two (2, 5) ... numbers form an arithmetic sequence of the

gogolik [260]3 years ago
3 0
<span>he sequence of Bell numbers, 1, 2, 5, 15 ... by consideration of the integral factors of 10 and 12: 10 has two (2, 5) ... numbers form an arithmetic sequence of the </span>
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Find the probability that the person is frequently or occasionally involved in charity work.
Schach [20]
Given the table below which shows the result of a survey that asked 2,881 people whether they are involved in any type of charity work.

\begin{tabular}&#10;{|c|c|c|c|c|c|}&#10; &Frequently&Occassionally&Not at all&Total\\[1ex]&#10;Male&227&454&798&1,479\\&#10;Female &205&450&747&1,402\\&#10;Total&432&904&1,545&2,881&#10;\end{tabular}

Part A:

If a person is chosen at random, the probability that the person is frequently or occassinally involved in charity work is given by

P(being \ frequently \ involved \ or \ being \ occassionally \ involved)\\ \\= \frac{432}{2881} + \frac{904}{2881} = \frac{1336}{2881}=\bold{0.464}



Part B:

If a person is chosen at random, the probability that the person is female or not involved in charity work at all is given by

P(being&#10; \ female \ or \ not \ being \ involved)\\ \\= &#10;\frac{1402}{2881} + \frac{1545}{2881}-\frac{747}{2881} = &#10;\frac{2200}{2881}=\bold{0.764}



Part C:

If a person is chosen at random, the probability that the person is male or frequently involved in charity work is given by

P(being&#10; \ male \ or \ being \ frequently \ involved)\\ \\= &#10;\frac{1479}{2881} + \frac{432}{2881}-\frac{227}{2881} = &#10;\frac{1684}{2881}=\bold{0.585}



Part D:

If a person is chosen at random, the probability that the person is female or not frequently involved in charity work is given by

P(being&#10; \ female \ or \ not \ being \ frequently \ involved)\\ \\= &#10;\frac{1402}{2881} + \frac{904}{2881} + \frac{1545}{2881}-\frac{450}{2881}-\frac{747}{2881} = &#10;\frac{2654}{2881}=\bold{0.921}



Part E:

The events "being female" and "being frequently involved in charity work" are not mutually exclusive because being a female does not prevent a person from being frequently involved in charity work.

Indeed from the table, there are 205 females who are frequently involved in charity work.

Therefore, the answer to the question is "No, because 205 females are frequently involved charity work".
4 0
3 years ago
Edwina measured the length of this swimming pool by drawing similar triangles as shown. What is the best estimate of p, the leng
Paraphin [41]

Answer:

Option C. p=33\ ft

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its corresponding sides is proportional

In this problem

Using proportion

\frac{p}{12}=\frac{22}{8}\\ \\p=12*22/8\\ \\p=33\ ft

7 0
3 years ago
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9x ≥117 which numbers below belong to the solution set of the inequality
lakkis [162]
9 x ≥ 117

Divide both sides by 9 :

9 x / 9 ≥ 117 / 9

x = 117 / 9

x ≥ 13

hope this helps!
7 0
3 years ago
Use the equation s = m - 7 to find the value of s when m = 10.
fgiga [73]
S=3
I believe
Because 7-10=3 and it don’t change the other way I think hahaha
7 0
3 years ago
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Landon bought 4 pounds of walnuts for $10.92. What is the constant of proportionality that relates the cost in dollars, y, to th
Lunna [17]

Step-by-step explanation:

The constant of proportionality is the ratio of the cost to the number of pounds of walnuts.  In other words, it is the price of one pound of walnuts.

$10.92 / 4 lb = $2.73 / lb

6 0
3 years ago
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