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4 years ago

Dang it these are tricky for me can somebody help?

Mathematics

1 answer:

erica [24]4 years ago

5 0

Answer:

It has no perfect square factors, unless you count 1 = 1^2. That's sort of a degenerate case we don't usually count, since every integer has that factor. We would usually say that 1290 is a square-free integer. Hope this helps!!

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On a multiple choice test with 15 questions, each question has four possible answers, one of which is correct. For students wh

Aleks [24]

Answer:

The variance for the number of correct answers is 2.8 questions

Step-by-step explanation:

The number of correct answers follows binomial distribution, in which we have:

n identical and independents events: the 15 questions
two possibles results that we call success and fail: The answer is correct and the answer is incorrect
probability p of success and 1-p of fail. Probability 1/4 of get the answer correct and probability of 3/4 of get the answer incorrect. This probabilities are calculated on that way because every question have 4 possible answers and one of which is correct.

So, the variance for a variable x that follows a Binomial distributions is:

V(x)=n*p*(1-p)

Then, the variance for the number of correct answers is:

V(x)=15*(1/4)*(3/4) = 2.8125 ≈ 2.8

Because n is equal to 15, p is equal to 1/4 and (1-p) is equal to 3/4.

5 0

4 years ago

Please help with this only

Vitek1552 [10]

I'm going to say b because it wouldn't switch to 91 and it didn't the 4/3 would stay the same

6 0

4 years ago

Please help asap 40 pts

navik [9.2K]

Answer:

a. 30

Step-by-step explanation:

There’s a property that’s says that when 2 lines are parallel and an other is secant then if the alternate interior angle are the same . So I think that’s it I’m really sore if it’s total nonsense but I tried my best .

4 0

3 years ago

Read 2 more answers

Easy Question, Easy Points Topic: Volume

EleoNora [17]

Answer:

a 125600 cm^3

b 327910.2 m^3

Step-by-step explanation:

The volume of a cylinder is given by

V = pi r^2 h

a = 3.14 (20)^2 100

=125600 cm^3

b We know the diameter r =d/2 = 118/2 =59

V = pi r^2 h

3.14 (59)^2 *30

327910.2 m^3

4 0

4 years ago

Read 2 more answers

Help me with question 3. (It will be 33 points)

adoni [48]

Answer:

PartA

P = 4a

Part B

60 = P fence + 2a

60 = 6a

Part C

Step-by-step explanation:

We are building a fence so we are finding perimeter.

Adding the 3 sides

P = a+b+a

P = 2a+b

It is twice as long as it is wide

b= 2a

Replace in the equation for perimeter

P = 2a+(2a)

P = 4a

Part B

We know the perimeter is 60 for the entire backyard

The perimeter of the backyard is the fence plus the longer side

60 = P fence + b

Replacing b

60 = P fence + 2a

We know the equation for the perimeter of the fence is

60 = 4a + 2a

Combing like terms

60 = 6a

Part C

Solve for a and b

60 = 6a

Divide each side by 6

60/6 = 6a/6

10 =a

P fence = 4a

P = 4(10) = 40

5 0

3 years ago