Kennedy buys cell phone cases for $4.50 and sells them to her friends for $18.00. What is the percent mark-up? (HINT: use the percent of change method)

(: the two box-and- whisker plots below show the scores on a math exam for two classes. what 2 things do the interquartile range tell you about the two classes?

The elmina wilson company produces spaghetti sauce that is used in restaurants. the fixed costs total $1,329,050. the selling price per 64 oz. can of sauce is $12.40. the variable cost per can is $4.80. what is the break-even point in number of cans?

Can someone tell me if these are correct?