3) From home Marty walks 40m down the street to the post office, then 120m over to the
local grocery store, then 200m back home. If
the trip took 90min,
a) What was her average speed?
b) What was her average velocity?

i think this could be a possible answer (1 / 84) -1

good luck! : d

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;