Question 7 (30 points): Given a sample of 12 users and 6 books from a ratings matrix (utility matrix), estimate the rating of book 3 by user 3, using Pearson correlation. USERS 1 2 3 4 5 6 7 8 9 10 11 12 1 1 BOOKS 2 355 5 5 4 4 2 3 2 4 2 1 4 2 4 5 4 254 3 4 3 4 2 6 1 3 3 2 415224 3 5

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A: Given 12x2+x-y-1=0

Q: 3. Solve: 22-(-18)+7+(-42)-27 =

A:

Q: R =  C − S t ; S

A: R=C-St

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A: a=(b+c-d)/3

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A:

Q: 15. Si dt 1³ + 1² - 2t

A:

Q: Solve for x. 2 ex + xeX = 0 O A. -5 O B. 2 O C. 3 O D.-3 ОЕ. -2

A: 2ex+xex=0