The average high temperature in Phoenix in January is 50o F. Choose a cosine function representing the temperature over a 1 day cycle that begins at the low temperature. Select one:
a. y = 15 cos2πΘ +35
b. y = - 15 cos2πΘ +35
c. y = 30 cos2πΘ +15
d. y = 30 cos2πΘ +35

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.

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;