Radhika bought a dozen pens at the rate of Rs 5.00 per pen. She sold 6 of them for Rs 7.5) each and the rest for Rs 6.75 each. What was the profit or loss?

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

How far is x from 5 on a number line?

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression