A chemist performs an experiment in which she varies the surface area of 10-g samples of zinc metal to determine how this will affect the reaction rate
of the zinc when it is mixed with 100 mL of hydrochloric acid. In this
experiment, which is the independent variable?
A. the mass of the zinc
B. the surface area of the zinc
C. the reaction rate of the zinc
D. the volume of the hydrochloric acid

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