Directions: Simplify the following monomials (if possible). 9.) -25xy² - 25xy²
10.) -50ac²d + ac²d
11.) 3y + 9z + 4y - 3z
12.) 12b + 8a - 10b

ANYONE PLEASE HELP ME IN 9-12:(​

Suppose you want just guess at the answers in a 5 question multiple-choice test. each question has 3 responses and only one is correct. what is the probability of getting two questions right just guessing? 20 points 0.3275 0.2753 0.7532 none of the above

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?