How do I solve this ?

Mathematics

1 answer:

xenn [34]3 years ago

8 0

To solve these problems, you must make the denominators of each fraction match, before adding.

2. The answer is 11/10 or 1 and 1/10.

To find this answer, multiply 1/5 by 2/2 to get 2/10. Then add 2/10 to 9/10 get 11/10 or 1 and 1/10 as your answer.

4. The answer is 23/18 or 1 and 5/18.

To find this answer, multiply 7/9 by 2/2 to get 14/18, and multiply 1/2 by 9/9 to get 9/18. Then add 14/18 and 9/18 to get 23/18 or 1 and 5/18 as your answer.

6. The answer is 7/12.

To find this answer, multiply 1/3 by 4/4 to get 4/12 and multiply 1/4 by 3/3 to get 3/12. Then add 4/12 and 3/12 to get 7/12 as your answer.

I hope this helps!

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Helpppp <br> im bad at dis

Fantom [35]

Adding zero would do nothing to it.

D is your answer.

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STSN

4 0

3 years ago

Read 2 more answers

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

Can someone help me please

Korolek [52]

Here’s the the answer and an explanation of how to get it :)