Use the quadratic formula to solve the equation. (All solutions are real numbers.)
s2 + 
s + 
= 0
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem.In a certain memory experiment, subject A is able to memorize words at a rate given by 
In the same memory experiment, subject B is able to memorize at the rate given by 
How many more words does subject B memorize from t = 0 to t = 19 (during the first 19 minutes)?
A. 16 B. 29 C. -7 D. -21
Change to decimal numbers.
A. 4.7 B. 0.36 C. 0.047 D. 0.47
Add or subtract. Write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
?An airplane flying at an altitude of 4 miles passes directly over a radar antenna. When the airplane is 25 miles away 
, the radar detects that the distance s is changing at a rate of 220 miles per hour. What is the speed of the airplane? Round your answer to the nearest integer.
?
A. ?223 mi/hr B. ??206 mi/hr C. ?446? mi/hr D. ??111 mi/hr E. ??103 mi/hr