3. A hydrated salt sample is analyzed and found to contain 4.07 g of potassium, 1.61 g of phosphorus,
2.91 g of oxygen, and 1.41 g of water. What is the empirical formula of this hydrated salt?

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup