Find the cross product and determine whether the proportion is true or false. = 

A. 164.25 = 110.25; true
B. 110.25 ? 248.0625; false
C. 165.375 = 165.375; true
D. 165.375 ? 165.375; false


Answer: C

Mathematics

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A. 6
B. 3
C.
D.

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Solve the problem.A certain radioactive isotope decays at a rate of 1% per 500 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. -0.01005 B. -0.00002 C. 0.00002 D. 0.00538

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Find the limit.sec x

A. 0 B. -? C. ? D. 1

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Expand the number to its natural form.4.07 × 10-4

A. 0.0000407 B. 0.00407 C. 0.0407 D. 0.000407

Mathematics