The check digit 13 for an ISBN-13 with initial digits 12 … 12is determined by the congruence

(1 + 3 + ⋯ 13) + 3(2 + 4 + ⋯ 12) ≡ 0 (mod 10).

Determine whether the following 13-digit numbers is a valid ISBN-13.

978-0-073-20679-1

If f(x)= 3x+6 which of the following is the inverse of f(x)

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal, mutualistic, or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp