Algebra and Trigonometry: Structure and Method, Book 2

2000th Edition

ISBN: 9780395977255

Author: MCDOUGAL LITTEL

Publisher: McDougal Littell

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Concept explainers

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.

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Question

Chapter 4.8, Problem 21P

To determine

To find the speed within the legal limit ?

Expert Solution & Answer

Answer to Problem 21P

The car is going 60mi/s. The speed limit is 55mi/h.

Explanation of Solution

Given information: Equation, d=0.05r2+r . An automobile in a 55mi/h speed zone required 240 ft to stop.

Calculation: The required solution is obtained as,

The given equation is , d=0.05r2+r

d=0.05r2+r240=0.05r2+r4800=r2+20rr2+20r−4800=0(r−60)(r+80)=0r=60,−80

Ignore negative value.

t=60

Hence, the car is going 60mi/s. The speed limit is 55mi/h.

Chapter 4.8, Problem 20P

Chapter 4.8, Problem 22P

Chapter 4 Solutions

Algebra and Trigonometry: Structure and Method, Book 2

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