(a) Find the replacement time (in years) that separates the top 30 % from the bottom 70 % . (b) If the manufacturer wants to provide a warranty time so that only 3 % of the washer and dryer sets will be replaced before the warranty expires, what length of time (in years) would you recommend for the warranty?

Over a period of one​ week, a stock index did the​ following: On Monday the index went up by 3.3​%, on Tuesday it went up by 10.5​%, on Wednesday it went down by 3.4​%, on Thursday it went up by 0.6​%, and on Friday it went down by 6.2​%. What was the percentage​ increase/decrease of the index over the​ week?

Need only handwritten solution only (not typed one).

"On his tax return this year, Steve reports $575 income from interest. Assuming an interest rate of about 4.6%, about how much does Steve have invested?"