13. a new mystery novel will cost ally $26.60. if she earns $6.65 an hour, how many hours will
she have to work in order to purchase it?
a. 2
b. 19.95
c. 4
d. 189

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy