Solve.
+ 
= 
A. 3
B. -7
C. 0
D. No solution
Answer: D
Mathematics
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It makes sense that the larger the area of a region, the larger the number of species that inhabit the region. Many ecologists have modeled the species-area relation with a power function and, in particular, the number of species S of bats living in caves in central Mexico has been related to the surface area A measured in m² of the caves by the equation.
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Mathematics
Find the area of the sector formed by central angle 
in a circle of radius 
m.
?
A. 2.89 m2 B. 2.81 m2 C. 2.91 m2 D. 2.79 m2 E. 2.83 m2
Mathematics
Subtract. Use borrowing, if necessary.
A. 29 B. 139 C. 39 D. 131
Mathematics
Perform the indicated operation(s), whenever possible.Let A = 
and B = 
. Find A - B.
A. 
B. 
C. 
D. 
Mathematics