A person measures her heart rate by counting the number of beats in 30 s. If 39±2 beats are counted in 30.0±0.5 s, what is the heart rate and its uncertainty in beats per minute?

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32

its a, i had the same answer, its from study island right

step-by-step explanation:

$450 i think. hope this ☺

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;