Final answer:
To find how many votes Grace Reiner received out of 5000 votes cast, the correct mathematical expression would be the total number of votes minus the number not received by her, expressed as 5000 - Grace Reiner's votes. However, the supplied options may be based on a misunderstanding, as typically the number of votes for a candidate would not require subtraction from the total.
Step-by-step explanation:
To determine how many votes Grace Reiner received in an election where 5000 votes were cast, we must identify the correct mathematical expression. If we know the total number of votes and are trying to find the number of votes a particular candidate received, a subtraction operation would be suitable. Therefore, the correct expression would be:
Option A: 5000 - Grace Reiner's votes
This expression assumes we have the number of votes not received by Grace Reiner and want to subtract that amount from the total to find out Grace Reiner's vote count. However, the question seems to be phrased in a way that could be misinterpreted, as typically one would count Grace Reiner's votes directly rather than subtracting them from the total. If this is the intended reading, none of the given options are correct, and the expression would simply be "Grace Reiner's votes" without any arithmetic operation.