using mental math, solve the inequality 7 + a > 5 + 6. in the solution set, the variable a must be greater than what number?
To solve the inequality 7 + a > 5 + 6, we can simplify both sides:
7 + a > 5 + 6
7 + a > 11
Now, we can subtract 7 from both sides to isolate the variable a:
a > 4
Therefore, in the solution set, the variable a must be greater than 4.