MATHEMATICS HIGH SCHOOL

What is the closed linear form of the sequence of the negative even integers starting with -2?A) an = 2n
B) an = -2n
C) an = -2 - n
D) an = -2 + 2n

Answers

Answer 1

Answer: Hello,

n=1,2,3,.... and not 0

Answer B a(n)=-2*n

Answer 2

Answer:

Answer: It's B i did usa test prep and got it right

Step-by-step explanation:

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Answers

answer : a

step by step explanation :

A bag contains 8 purple marbles, 7 yellow marbles, 8 red marbles, and 3 blue marbles. What is the probability of drawing a purple marble, without replacing it, and then drawing a blue marble?

Answers

Answer:

12/325

Step-by-step explanation:

Purple marble: 8/26 = 4/13

Blue marble after: 3/25

3/25*4/13 = 12/325

In a version of the game of roulette, a steel ball is rolled onto a wheel that contains 19 red, 19 black and 2 green slots. If the ball is rolled 25 times, the probability that it falls into the green slots two or more times:___________.

Answers

Answer:

The probability is 0.3576

Step-by-step explanation:

The probability for the ball to fall into the green ball in one roll is 2/1919+2 = 2/40 = 1/20. The probability for the ball to roll into other color is, therefore, 19/20.

For 25 rolls, the probability for the ball to never fall into the green color is obteined by powering 19/20 25 times, hence it is 19/20^25 = 0.2773

To obtain the probability of the ball to fall once into the green color, we need to multiply 1/20 by 19/20 powered 24 times, and then multiply by 25 (this corresponds on the total possible positions for the green roll). The result is 1/20* (19/20)^24 *25 = 0.3649

The exercise is asking us the probability for the ball to fall into the green color at least twice. We can calculate it by substracting from 1 the probability of the complementary event: the event in which the ball falls only once or 0 times. That probability is obtained from summing the disjoint events: the probability for the ball falling once and the probability of the ball never falling. We alredy computed those probabilities.

As a result. The probability that the ball falls into the green slot at least twice is 1- 0.2773-0.3629 = 0.3576

In a factory there are three polishing machines, A, b, and C. when all three of them are working, 5700 lenses can be polished in one week. When only A and B are working, 3400 lenses can be polished in one week. When only B and c are working, 4200 lenses can be polished in one week. How many lenses can be polished in a week by each machine?

Answers

It would be answer B

On a standardized science test, the seniors at Fillmore High School have a mean score of 430 with a standard deviation of 90.For random samples of 100 seniors, what interval centered on the mean of the sampling distribution captures 68% of the mean scores? If necessary, round to the nearest tenth. Enter the interval from least to greatest.

For random samples of 100 seniors, 68% of the sample means fall between ____ and ___

Answers

Answer:

For random samples of 100 seniors, 68% of the sample means fall between 340 and 520

Step-by-step explanation:

As a property of normal distribution, 68% of sample means fall between mean - sigma(430 - 90 = 340) and mean + sigma (430 + 90 = 520) (here, sigma is standard deviation).

Hope this helps!

Evaluate a + b for a = 2 and b = 3.
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