Rob ran 6 2/3 miles and 4 11/16 on Sunday what is the total

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian 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? i need this done

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?