An experiment that involves learning in animals requires placing white mice and rabbits into separate, controlled environments, environment I and environment II. The maximum amount of time available in environment I is 200 minutes, and the maximum amount of time available in environment II is 100 minutes. The white mice must spend 16 minutes in environment I and 20 minutes in environment II, and the rabbits must spend 15 minutes in environment I and 50 minutes in environment II. Write a system of inequalities that describes the constraints on the number of each type of animal used in the experiment. Letxdenote the number of white mice andydenote the number of rabbits.
?
A. 
B. 
C. 
D. 
E. 
Answer: B
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A balloon that originally holds 13.6 cubic inches of air springs a leak. Let 
represent the volume, in cubic inches, of air in the balloon t minutes after the balloon starts to leak air. The average rate of change of V is -1.02 cubic inches per minute. Use these facts to estimate 
variablename="impvar_98b68c9b1eb64411bff2363d2" />. ? A. 13.6 cubic inches B. 23.80 cubic inches C. 11.57 cubic inches D. none of the above
Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse having a focus at (
, 0) and directrix x = 
.
A. 
+ y2 = 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve the problem.A flagpole casts a shadow of 36 ft. Nearby, a 10-ft tree casts a shadow of 6 ft. What is the height of the flag pole?
A. 60 ft B. 2160 ft C. 1.7 ft D. 21.6 ft
Solve by using the quadratic formula.5x2 - 34x - 7 = 0
A. - 
, 
B. - 
, 7
C. - 
, 5
D. -5, 7