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6th Edition

Stewart + 5 others

Publisher: Cengage Learning

ISBN: 9780840068071

Chapter 2, Problem 8RE

a.

To determine

To find

Expert Solution

The answer is

**Given:**

The expression E(x) is given.

**Concept Used:**

The concept of functions is used.

**Calculation:**

The expression of E is

To find E (2000), put x=2000 in the above expression.

To find E (15000), put x=15000 in the above expression.

**Conclusion:**

Hence, the answer is

b.

To determine

To write what the answers in part (a) represent.

Expert Solution

The E (2000) in the above part represent her earning for the week if she sells 2000 dollars’ worth of goods.

The E (15000) in the above part represent her earning for the week if she sells 15000 dollars’ worth of goods.

**Given:**

The expression

**Concept Used:**

The concept of functions is used.

The expression

**Conclusion:**

The E (2000) in the above part represent her earning for the week if she sells 2000 dollars’ worth of goods.

The E (15000) in the above part represent her earning for the week if she sells 15000 dollars’ worth of goods.

c.

To determine

To find out E (0).

Expert Solution

The E (0) = 400 which represents fixed cost.

**Given:**

The expression

**Concept Used:**

The concept of functions is used.

**Calculation:**

To calculate E(0), put x=0,

**Conclusion:**

So, E (0) = 400 which represents fixed cost.

d.

To determine

To find out the percentage Reynalda earns on the goods that she sells.

Expert Solution

The answer is 3 percent.

**Given:**

The expression

**Concept Used:**

The concept of percentage and functions is used.

**Calculation:**

To calculate percentage multiply the coefficient of x by 100,

**Conclusion:**

So, the answer is 3 percent.