Question 8 D Mr. Chen asked each student in his first-grade class to make one greeting card for every other student in the class. Mr. Chen collected the cards from all the students and correctly counted that he collected 200 cards. If r represents the total number of students in Mr. Chen's class, then each student should have made (x - 1) cards and Mr. Chen should have collected a (aI - 1) cards. Which of the following best explains why it is not possible that each student made the correct number of cards? The equationz (x - 1) = 200 does not have real solutions. B The equationa (x - 1) = 200 has one real solution, but the solution is not an integer. The equationz (z-1) = 200 has two real solutions, but neither of the solutions is an integer. D The equationr (-1) 200 has two real solutions, but one of the solutions is not an integer.

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Percentage

A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.

Algebraic Expressions

In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.

Numbers

Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.

Subtraction

Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.

Addition

Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.