Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 400e-0.092t, where t is the time in years? Round to the nearest hundredth year.
A. 36.80 yr
B. 7.53 yr
C. 72.66 yr
D. 65.12 yr
Answer: B
Mathematics
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Solve the problem.Find the centroid of the region enclosed between the cone with equation 
and the plane with equation 
A. (
, 
, 
) = 
B. (
, 
, 
) = 
C. (
, 
, 
) = 
D. (
, 
, 
) = 
Mathematics
Use sum-to-product identities to rewrite the expression as a product.cos 39° - cos 57°
A. -2 cos 48° cos 9° B. 2 sin 48° cos 9° C. -2 sin 48° sin 9° D. 2 sin 48° sin 9°
Mathematics
Identify the vertex of the parabola.y = 3x2 - 6x + 0
A. (3, -1) B. (-3, 1) C. (-1, 3) D. (1, -3)
Mathematics
Subtract.$65.50 - $44.00
A. $109.50 B. $22.00 C. $21.50 D. $21.60
Mathematics