Laura kept track of the trick-or-treaters who came to her door and found that 2/3 were dressed as ghosts and 1/6 were dressed as witches. What fraction of the trick-or-treaters were dressed as either ghosts or witches?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

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?