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

Mathematics

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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

Mathematics

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

Mathematics

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

Mathematics

Solve by using the quadratic formula.5x2 - 34x - 7 = 0

A. - 
B. - 7
C. - 5
D. -57

Mathematics