Cho lục giác đều ABCDEF có tâm O . Khẳng định nào sau đây là sai? A. Phép vị tự tâm O tỉ số 1 biến tam giác OEF thành tam giác OBC B. Phép tịnh tiến theo vecto AB biến tam giác OEF thành tam giác ODC C. Phép đối xứng qua CF biến tam giác OEF thành tam giác OAF D. Phép tịnh tiến theo vecto OE biến tam giác OEF thành tam giác BOA

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

What are the solutions of the equation? 6x^2 + 11x + 4 = 0 a. 4/3, 1/2 b. -4/3, -1/2 c. 4/3, -1/2 d. -4/3, 1/2

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry