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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Assuming that the equations define x and y implicitly as differentiable functions 
find the slope of the curve 
at the given value of t.x(t + 1) - 4t
= 9, 2y + 4y3/2 = t3 + t, t = 0
A. 6
B. 3
C. 
D. 
Mathematics
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
Mathematics
Find the limit.
sec x
A. 0 B. -? C. ? D. 1
Mathematics
Expand the number to its natural form.4.07 × 10-4
A. 0.0000407 B. 0.00407 C. 0.0407 D. 0.000407
Mathematics