5th Edition

ISBN: 9780134506609

Author: Beckmann

Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)

Concept explainers

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.

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Textbook Question

Chapter 2.5, Problem 20P

A county has two elementary schools, school A and school B. At school A, 30% of the children speak Spanish at home. At school B, 20% of the children speak Spanish at home. Use this information about the schools in all parts of this problem.

a. Tom says that 50% of the elementary school children in the county speak Spanish at home. Tom found 50% by adding 30% and 20%. Is Tom correct? Explain why or why not.

b. DeShun says that 25% of the elementary school children in the county speak Spanish at home. DeShun found 25% by averaging 30% and 20%.

i. If there are 400 children in school A and 100 children in school B, is DeShun correct that 25% of the elementary school children in the county speak Spanish at home? If not, what percent is it?

ii. If there are 100 children in school A and 400 children in school B, is DeShun correct that 25% of the elementary school children in the county speak Spanish at home? If not, what percent is it?

iii. Find circumstances under which DeShun is correct that 25% of the elementary school children in the county speak Spanish at home.

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Chapter 2.5, Problem 19P

Chapter 2.5, Problem 21P

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