1. Vanessa was buying DVDs of her old favorite TV series. She bought eight DVDs at the store and she bought seven online. How many DVDs did she buy total? 8 + 7 2. A mailman has to give twenty-eight pieces of junk mail to each block. If there are four houses on a block how many pieces of junk mail should he give each house?​

the answer would be c:   ax + b = ax + c

step-by-step explanation:

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.