Math. tom bought 15 party hats priced at 3 for $0.65 and 56 noisemakers priced at 7 for $1.25. what was the total cost of the hats and noisemakers, not including tax?

a. $9.75

b. $8.75

c. $10.70

d. $13.25

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.