Both 192ir and 137cs are used in barchytherapy, the use of radioactive isotopes to treat various cancers. both are beta emitters.
(a)explain how this observation is consistent .
(b)how do the the n/z ratios for these two medical isotopes compare to each other ? how do they compare to their nearest stable isotopes?

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

helium

oxygen

neon

sodium