The cost c of materials for a desk varies jointly with the width w and the length L If c=$470.40 When w=12 and L=16, find the cost when w = 10 and L=25

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

3.4a=57.8 what is the the value of a