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DerKrebs [107]
2 years ago
12

The first and last term of an A. P are 1 and 121 respectively. Find the number of terms in the A.P and the common difference bet

ween them if the sum of the term is 1281​
Mathematics
1 answer:
LuckyWell [14K]2 years ago
6 0

Answer:

No.of terms=21

Common difference=6

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A lottery consists of one $2000 winner, three $500 winners, and ten $100 winners. a total of 1000 tickets are sold for $10 each.
Semenov [28]

Answer: -5.5

 

WOKINGS

Given that the lottery has the following number of winners:

One $2000 winner

Three $500 winners

Ten $100 winners

 

Also Given,

A total of 1000 tickets are sold

Each ticket costs $10

 

The expected winning for a person purchasing one ticket is the sum of the products of the gain/loss and their corresponding probability.

 

There is one $2000 winner

There are 1000 tickets

The probability of winning $2000

= 1/1000

= .001

There are three $500 winners

There are 1000 tickets

The probability of winning $500

= 3/1000

= .003

 


There are ten $100 winners

There are 1000 tickets

The probability of winning $100

= 10/1000

= .01

 

Since each ticket costs $10

Everyone who buys a ticket automatically loses $10.

Therefore, the probability of losing $10 is 1

 

Now to calculate the expected winning for a person purchasing one ticket

= 2000(.001) + 500(.003) + 100(.01) – 10(1)

= 2 + 1.5 + 1 – 10

= -5.5

 

The expected winning is -5.5. This implies that a person playing this lottery can expect to lose $5.50 for every one ticket that they purchase. 

7 0
3 years ago
The book store is having a sale. Every book is $5 off, regardless of the original price.
jarptica [38.1K]

Answer:

y=x-5

Step-by-step explanation:

sale price (y) is equal to the original (x) minus five dollars

5 0
2 years ago
Read 2 more answers
Is 6x² + 5x polynomial
DIA [1.3K]
In general polynomial <span>is an </span>expression<span> consisting of </span>variables<span> (or </span>indeterminates<span>) and </span>coefficients<span>, that involves only the operations of </span>addition<span>, </span>subtraction<span>, </span>multiplication<span>, and non-negative </span>integer exponents<span>. 
So this equation is polynomial</span>
4 0
3 years ago
Read 2 more answers
The midpoint between points (-3, 8) and (3, -4) is (0, y). What is y?​
Sonbull [250]

The midpoint between points (-3, 8) and (3, -4) is (0, 2)

5 0
3 years ago
Factor the expression completely.
densk [106]

Answer:

\fbox{\begin{minipage}{13em}Option D: 2(3x + 4)(3x - 4)\end{minipage}}

Step-by-step explanation:

      A = 18x^{2}  - 32\\

Find the sharing components:

<=> A=2*9*x^{2} - 2*16

Apply the inverse of associative property:

<=> A = 2(9x^{2} - 16)

Identify two square components inside the parenthesis:

<=> A = 2((3x)^{2} - 4^{2} )

Factorize:

<=> A = 2(3x + 4)(3x - 4)

=> Option D is correct

Hope this helps!

:)

3 0
3 years ago
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