Solve.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. An artifact is discovered at a certain site. If it has 60% of the 
it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.0125% annually.) (Round to the nearest year.)
A. 3200 yr
B. 4087 yr
C. 1775 yr
D. 4800 yr
Answer: B
Mathematics
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Solve the problem.A geometric progression is a sequence of terms in which each term is r times the preceding term. The sum of the first two terms of such a sequence, where a is the first term, is given by the expression 
. Simplify the expression.
A. a(1 + r) B. a + r C. a(1 - r) D. a(1 + r2)
Mathematics
Use the factor theorem to decide whether or not the second polynomial is a factor of the first.-8x3 + 30x2 - 7x + 4; x + 4
A. Yes B. No
Mathematics
Determine if the ordered pair is a solution to the system of linear inequalities in two variables.
(10, 1)
A. Yes B. No
Mathematics
Solve.
= 3
A. 20, 50 B. 50 C. 20 D. 20, 50, 0
Mathematics