Math 060 Quiz 2 Answer Key

MATH 060 ______ANSWER KEY_______________

TTh 1:30-3:35, Room A-107

QUIZ 2 September 9, 2008 1. (4 points) Solve this inequality and graph your answer: 1 x + 2 < x+ 7 3 1 1 Soln: − x − x 3 3 2 x+2 < 7 3 –2 –2 2 x < 5 3 Divide by 2/3 both sides:

2. (3 points) Answer this question: 2% of what is 1000?

Soln: Let B be the base amount we’re looking for. Then:

2% of B is 1000

Or:

(2%) B = 1000 0.02 B = 1000

15 5 3 x< Answer: x < or: x < 7.5 = 5⋅ 2 2 ⎛2⎞ ⎜ ⎟ ⎝3⎠

B=

1000 = 50,000 0.02

3. (3 points) The table below shows enrollment history at SCC, rounded to the nearest hundred. Year: Enrollment: a.

2004 9,900

2005 8,500

2006 9,600

2007 10,600

What is the average change from 2004 to 2005?

New Value − Old Value 8500 − 9900 − 1400 = = = −1400 students/year 1 New Time − Old Time 2005 − 2004 Or: Down 1400 a year What is the average change from 2005 to 2007?

Soln: Average rate of change = b.

Soln: Average rate of change = c.

New Value − Old Value 10600 − 8500 2100 = = = 1050 students/year 2007 − 2005 2 New Time − Old Time

What is the average change from 2004 to 2007?

Soln: Average rate of change =

New Value − Old Value 10600 − 9900 700 = = = 233.33 students/year 2007 − 2004 3 New Time − Old Time