Solve the problem.Find the area A and circumference C of a circle of diameter 20 yd. Use 3.14 for ?. Round the result to the nearest tenth.
A. A = 62.8 yd2; C = 62.8 yd
B. A = 125.6 yd2; C = 31.4 yd
C. A = 1256 yd2; C = 31.4 yd
D. A = 314 yd2; C = 62.8 yd
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
Simplify.
A. 40
B. 30
C. 
D. 10
Mathematics
Solve the problem.If n(A ? B) = 56, n(A ? B) = 26, and n(A) = n(B), find n(A).
A. 28 B. 41 C. 13 D. 15
Mathematics
Find the exact value by using a sum or difference identity.cos 285°
A. - 
B. 
C. -
(
+ 1)
D. -
(
- 1)
Mathematics