Final answer:
The lower limit of the confidence interval is -30 and the upper limit is 147.6.
Step-by-step explanation:
The given confidence interval is 58.8±88.8. To express this in the form of a trilinear inequality, we need to separate the lower and upper limits of the interval.
The lower limit of the interval is obtained by subtracting the margin of error (88.8) from the sample mean (58.8): 58.8 - 88.8 = -30. The upper limit of the interval is obtained by adding the margin of error to the sample mean: 58.8 + 88.8 = 147.6.