Use substitution y=2x+6;y=5x

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Sketch one cycle if the cosine function y=2cos2theta

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?