Jamie tried to solve an equation step by step.

2/5n+7=12

2/5n=5 (step 1)

n=2 (step 2)

find jamie's mistake

a: step 1

b: step 2

c: jamie did not make a mistake

this is for 10 points and i will be giving out yous and

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

Can any one me with the answers to these questions asap?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)