An investigator wanted to see whether packaging information affects the way teenagers rate the effectiveness of soap. the same soap was put in three packages: (a) a pink wrapper that says "for keeping your skin baby soft," (b) a red wrapper that says "for eliminating acne," and (c) a white wrapper that says nothing. each teenager was asked to rub his or her face with dirt and wash with soap a; the same procedure was followed for soaps b and then c. the time it took to get the face clean was recorded each time. what factors in addition to the intended independent variable might influence the results?

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

Francisco's credit card has an apr of 28.98%, calculated on the previous monthly balance. his credit card record for the last 7 months is shown in the table below francisco is trying to figure out what this all means. answer the following questions: what is the total amount that francisco has paid in interest over the 7 months? what is the total amount that francisco has made in payments over the 7 months? how much of francisco's payments have gone to paying down the principal on his account? what is francisco's new balance at the end of month 8? what will francisco be charged for interest for month 8?