Rates, work, mixtures, and weighted averages

By the end you’ll be able to

• apply the relationship $\text{rate}\times\text{time}=\text{distance}$ to solve uniform-rate and relative-rate problems
• calculate combined work rates and total completion times for two or more workers or machines
• set up mixture equations using amount, concentration, or weighted-sum relationships
• compute weighted averages and distinguish them from simple arithmetic means