A family's monthly utility costs are $130 for phone, $150 for electric, $105 for cable TV, $65 for water/gas, and $75 for Internet. By eliminating cable, by what percent does the family reduce total utility cost?

Which equation matches the graph shown ?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?