Question 35443
Let x be the number of dimes 
Let y be the number of nickels

A dime is 10 cents equivalent to $(10/100) = $0.1
A nickel is 5 cents equivalent to $(5/100) = $0.05

The change in the drawer is atleast $30 which means the change in the drawer can be either $30 or more than $30

the total amount in dollars from the combination of dime and nickls
is 0.1*x + 0.05*y. This amount must be greater than or equal to 30.

0.1*x + 0.05*y >= 30