Determine which choice(s) is/are correct? i. stirring slows down (decreases) rate of dissolution. ii. grinding solids increases their surface area of contact. iii. heating slows down (decreases) rate of dissolution. iv. grinding solids speed up their rate of dissolution. a) i, ii, and iii b) ii and iv c) i and iii d) iii and iv

Answer B- II and IV.

Grinding the solids increases their surface area of contact with the solvent. Hence this results in increased rate of dissolution. Also by grinding the large particles into smaller pieces,the resistive power is reduced and this results in increased rate of dissolution.

Example normal sugar dissolves faster in a solvent than a sugar cube due to reduced contact surface  area with the solvent.

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

the answer is a)

mark brainliest