She used the associative property which should only be used with positive numbers (sorry if it isn't the answer you're looking for)
The inequality is 7x + 21 
Step-by-step explanation:
<u>DATA:</u>
Let the number be x
Number times 7 = 7*x
Sum of a number times 7 and 21 = 7x + 21
Is at least 29
<u>INEQUALITY:</u>
7x + 21 
<u>SOLVE:</u>
7x
7x
x 
Therefore, the inequality is 7x + 21 
Keyword: Inequality
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Answer: 18
Explanation: Divide the diameter by 2.
I think the ticket booth would be 7 feet high. 160/64 = 2.5. 2.8 x 2.5 = 7