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Due to the shortest studen has a height of 155cm and the tallest one has a height of 190cm. You consider these numbers as the limits of the interval for the height of the students of the ninth grade.
if x is the height of the students, it is necessary that x is lower or equal than 190cm, moreover, it is necessary that x is equal or greater than 155cm.
The previous situation can be written as the following inequalities:
x < 190
x > 155
however, the previous inequalities can be written as one double inequality:
155 < x < 190