Solve the problem.A certain radioactive isotope decays at a rate of 3% per 100 years. If t represents time in years and y represents the amount of the isotope left, use the condition that 
to find the value of k in the equation 
A. 0.00030
B. 0.02638
C. -0.00030
D. -0.03046
Answer: C
Mathematics
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Find the area under the curve of the function on the stated interval. Do so by dividing the interval into n equal subintervals and finding the area of the corresponding circumscribed polygon.f(x) = 2x2 + x + 3 from x = -2 to x = 1; n = 6
A. 7 B. 13 C. 11 D. 9
Mathematics
Use a calculator to perform the operation. Express your answer in scientific notation.
A. 2.87 × 1025 B. 2.87 × 1027 C. 2.865657742 × 1027 D. 6.62 × 101
Mathematics
Find the exact value under the given conditions.sin ? = 
, 0 < ? < 
; cos ? = 
, 0 < ? < 
Find cos (? + ?).
A. 
B. 
C. 
D. 
Mathematics
Express the set in the simplest interval form.(-?, 8] ? (-?, -8)
A. (-?, 8) B. (-8, 8] C. (-?, -8] D. (-?, 8]
Mathematics