Work the application. Write a legend and an equation. Solve the equation and answer in a complete sentence.The seats in a lecture hall are arranged in 20 rows with 7 seats in each row. Find how many seats are in this room.
A. Let s = the number of seats in the room.
7 ? s = 20
There are 147 seats in the room.
B. Let s = the number of seats in the room.
7 ? 20 = s
There are 150 seats in the room.
C. Let s = the number of seats in the room.
20 ? s = 7
There are 133 seats in the room.
D. Let s = the number of seats in the room.
20 ? 7 = s
There are 140 seats in the room.
Answer: D
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Find the following. Assume that letters can represent any real number.
A. 
- 4
B. x - 4
C. 
D. 4 - x
Multiply and reduce answers to lowest terms. Write improper fractions as whole or mixed numbers.
? 
? 
A. 
B. 
C. 
D. 
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 2x
B. x
C. 2x
D. 2x
Find the standard form of the equation for the ellipse satisfying the given conditions. Center (0, 0); foci (0, ±5); b = 3
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1