An animal shelter has two purebred Labradors among the 81 dogs available for adoption. It is also known that 7/9 of the dogs are mongrels. How many of the dogs are purebreds?
?
A. 16 dogs
B. 21 dogs
C. 9 dogs
D. 18 dogs
E. 63 dogs
Answer: D
Mathematics
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Solve the equation symbolically.
- 
= 3
A. 3, 8 B. -2 C. 2, 38 D. 2
Mathematics
Solve for y in terms of x.log 2 x + log 2 y = 1
A. y = 
B. y = 1 - x
C. y = 
D. y = 2 - x
Mathematics
Solve the equation by completing the square.0.1x2 - 0.2x - 0.6 = 0
A. {1 ± 
}
B. {2 ± 
}
C. {2 - 
}
D. {1 + 
}
Mathematics
Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given angle. Give exact answers with rational denominators.Find cos A when a = 
and c = 13.
A. 
B. 
C. 
D. 
Mathematics