Find the product.(5x - y + 2)(5x - y - 2)
A. 25x2 - 10xy + y2 - 4
B. 25x2 + y2 - 4
C. 25x2 + y2 + 20x + 4y - 4
D. 25x2 - 10xy + y2 + 20x + 4y - 4
Answer: A
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Solve the problem.A measure of diversity of species in an ecological community is given by the formula 
where P1, P2, ... ,Pn are the proportions of a sample belonging to each of n species found in the sample. A sample of a community shows three species with 48 individuals each. Find the index of diversity H.
A. 1 B. 0.53 C. 2.1 D. 1.6
Solve the problem.The area of a circle is found by the equation A = ?r2. If the area A of a certain circle is 144? square centimeters, find its radius r.
A. r = ± 12 cm
B. r = 12 cm
C. r = 12? cm
D. r = 12
cm
Divide.
A. 
- 7i
B. -7 - 
i
C. - 
+ 7i
D. 7 + 
i
Find the circumference of the circle. Use 3.14 or 
for ? as indicated.Find the exact circumference. (Leave answer in terms of ?.)
A. 5? ft B. 20? ft C. 25? ft D. 10? ft