Final answer:
The mathematical sentence expressing Susanne's observation that if the temperature rises by 6 more degrees it will break the record high of 84 degrees is T + 6 > 84.
Step-by-step explanation:
To write a mathematical sentence that expresses the information provided, we need to use an equation to represent the temperature change and the record-breaking condition. Let's denote the current temperature at 11:00 a.m. as T. According to the given information, if the temperature goes up by 6 degrees, it will exceed the record high of 84 degrees. The sentence can be represented algebraically as:
T + 6 > 84
84 degrees is the record high which needs to be surpassed, temperature rise is the change that will occur, and the result should be a temperature that is higher than the record. When checking this answer, one should ensure that the temperature change does not result in a phase change that wasn't accounted for, such as liquid water becoming ice or water vapor.