MATH 121 – 19 CHAPTER 1&2/TEST 1 STUDY SHEET
1. 3X - 4 = 5X + 3
8 2
2. X + 2 = 2X – 7
5 3
3. Graph: y = x² + 4x – 32
a. Give the Vertex Point
b. Give the y-intercept
c. Give the X-intercepts
d. Graph it
4. Find the Domain of each:
a. y = -2x + 7
b. y = (x+5) square root of the group (x+5)x+5) square root of the group (x+5) square root of the group (x+5)x+5)
c. y = x + 2
x + 7
5. You will invest $75000 in two types of stock. You will need to earn $9810 per
year in order to pay the taxes and insurance on your beach-front property.
How much will you invest in each if one stock earns a 15% return and the
other one a 9% return?
6. Fixed costs per week for a computer company is $3250 and the variable
cost on the computer they supply is $500. If the computers sell for $1150
each, find the following:
a. The Revenue Function
b. The Cost Function
c. The Profit Function
d. The Break-even quantity
