Question

8. How old is a skeleton that has lost 35% of its carbon-147 The half-life of carbon-14 is 5700 years. (Round the answer to the whole number of years) (5 pts.) 9. To create a college fund, a parent makes a sequence of 18 yearly deposits of $2000 each year in a savings account, on which interest is compounded annually at 2.8% Find the amount of annuity (5 pts)

Answer 1

we are supposed to answer only first question

old skeleton lost 35% of e-14 65) cremaing = 100-35- Half life = 5700 years to Plt)=Polt) t/stoo 65 Po Po (t) 100 +/5700 apply a on both sides anana namina 65 10.5) loo 210.65) I Inlos) 5700 3547.483747 yeary = X t=2110.66) 5700 Imlo's) CS Scanned with CamScanner