The teacher wrote the three-digit number * * 8 he imagined on the board. Three students made two assumptions about the given number. Student 1: All digits are even and it has an even number of different prime factors. Student 2: It is a multiple of 9 and it is a perfect square. Student 3: It is less than 400 and it is 13 times greater than one perfect square. Which number did the teacher imagine if each student guessed just one assumption?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.