Evaluate the expression.
2
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.The amount of a certain radioactive isotope present at time t is given by 
grams, where t is the time in years that the isotope decays. The initial amount present is 400 grams. How many grams remain after 20 years? Round to the nearest hundredth.
A. 379.25 g B. 397.87 g C. 234.78 g D. 681.48 g
Express the function, f, in simplified form. Assume that x can be any real number.f(x) = 
A. f(x) = 4(x + 3)
B. f(x) = 
C. f(x) = 4(x + 3) 4
D. f(x) = 4(x + 3)4
Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first six terms of the geometric sequence: -3, -15, -75, . . . .
A. 11718 B. - 3906 C. -93 D. - 11718
Solve the equation on the interval 0 ? ? < 2?.5 csc ? - 2 = 3
A. 
B. 
C. {2?}
D. {?}