Question

http://prnt.sc/cnwh5k Help please

Answer 1

Average increase of 1-10: .3 $/day. Average increase of 11-20: -.45 $/day. Average increase of 21-30: .25 $/day.
1) For an increase of $.3 per day for ten days, multiply the number of days by your rate of increase (d*r), 10*.3=3. The stock would change $3 dollars in the first ten days.
2) Same as #1, d*r=10*-.45=-4.5, so the stock would decrease by $4.5 dollars within the second set of ten days.
3) Same as #1 and #2, 10*.25=2.5, so your stock would increase by $2.5 in your last 10 days.
4) Your overall change would just be the change for each ten day period combined, so #1+#2+#3=3+(-4.5)+2.5=5.5-4.5=1, so over the thirty day period, your stock increased by $1.
5) As you decided to buy the stock if it increased over the thirty day period, and it increased by $1, you should buy the stock.

Answer 2

Thanks (: