Jerry estimates that there are m marbles in a jar. Harry knows the actual number of marbles (n) is within 10 marbles of Jerry’s estimate. Which inequality shows this relation?

by

A) n + 10 < m < n – 10
B) m – 10 < n < m + 10
C) n < m – 10
D) None of these

🧠 Explanation (Math):

Given: Actual marbles n is within 10 of estimate m
Step 1: “Within 10” means |n − m| < 10
Step 2: Rewrite absolute inequality: −10 < n − m < 10
Step 3: Add m throughout: m − 10 < n < m + 10
Final Answer: m − 10 < n < m + 10