4. Johanna received a $30.00 gift card to download songs from an on-line store. The cost of each song is $1.50. Which of the following equations could be used to determine the amount of money, m, left after d songs are downloaded?

4. Johanna received a $30.00 gift card to download songs from an on-line store. The cost of each song is $1.50. Which of the following equations could be used to determine the amount of money, m, left after d songs are downloaded?

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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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.

Question

4. Johanna received a $30.00 gift card to
download songs from an on-line store. The
cost of each song is $1.50. Which of the
following equations could be used to
determine the amount of money, m, left
after d songs are downloaded?
A. m 30 +1.5d
C. m 30d -1.5
%3D
B. m 30-1.5d
D. m 30d +1.5
D.
OOOO

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