Learning Materials
Features
Discover
Chapter 2: Q1. (page 80)
What are terms that have a number but no variable called?
The terms that have a number but no variable are called Constants.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Write a variable expression to represent the phrase.
7 more than a number
Simplify the expression.
Astronomy Cepheid stars appear to pulsate because they expand and contract in size. In its contracted phase, the Cepheid star Zeta Geminorum is 51 million miles across. This is 5 million miles less than the star鈥檚 distance across in its expanded phase. Find the distance across Zeta Geminorum in its expanded phase.
Error Analysis Describe and correct the error in solving.
Challenge The problem below is a variation of one that appears in the ancient Chinese text Nine Chapters on the Mathematical Art. (In the problem, a tou is a Chinese unit of measure.)
A goat, a horse, and a cow mistakenly enter a farmer鈥檚 wheat field and eat some stalks of wheat. The horse eats twice as many stalks as the goat, and the cow eats twice as many stalks as the horse. The farmer demands 5 tou of wheat from the owners of the animals to replace what was eaten. How much wheat should be replaced by the goat鈥檚 owner? by the horse鈥檚 owner? by the cow鈥檚 owner?
a. Let x be the amount of wheat (in tou) that should be replaced by the goat鈥檚 owner. What is an expression in terms of x for the amount that should be replaced by the horse鈥檚 owner? by the cow鈥檚 owner?
b. Write and solve an equation to find x. To the nearest tenth of a tou, how much wheat should be replaced by each animal鈥檚 owner?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine