Betty glacier is a manufacturer's representative for a plastics company. she travels all over the country selling her company's products. her total monthly expenses for august, september, and october were $2,756.11, $7,111.20, and $5,080.70. what was her average monthly expenditure?

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

i think it is c hope that

6cm

step-by-step explanation:

i may be incorrect but i believe that her first error was in step one when she multiplyed her equation by 1/4 when she should have divided it by 1/4