Need this now !
the chemical reaction equation below demonstrates that?

2zn+2hci-> 27nci + h2

a: matter cannot be created and destroyed by a chemical reaction
b: the reactants are the same substance as the products.
c: the number of molecules in the reactants is equal to the number of molecules in the products.
d: the atoms on the reactants side are changed into different atoms on the products side

Perry is a freshman, he estimates that the cost of tuition, books, room and board, transportation, and other incidentals will be $30000 this year. he expects these costs to rise about $1500 each year while he is in college. if it will take him 5 years to earn his bs, what is the present cost of his degree at an interest rate of 6%? if he earns and extra $10000 annually for 40 years, what is the present worth of his degree.?

What is considered to be a significant disadvantage of owning

Eon inc., electravia inc., and fc inc., the three largest firms in the consumer electronics industry, hold close to 85 percent of the industry's market share. these companies mainly compete against each other by providing unique features in their products rather than pricing them low. these firms are interdependent, and each firm must consider the strategic actions of its competitors. which of the following industry competitive structures does this scenario best illustrate? monopolistic competition oligopoly monopoly perfect competition