Solve the problem.How many three-digit counting numbers are even?
A. 499 numbers
B. 490 numbers
C. 510 numbers
D. 450 numbers
Answer: D
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Find the derivative of y with respect to the independent variable.y = t2 - e
A. (1 - e)t2 - e
B. t2 - e
C. (2 - e)t1 - e
D. 
Use set-builder notation to describe all real numbers satisfying the given conditions.A number increased by 8 is no more than two times the number.
A. {x|x + 8 ? 2x} or 
B. {x|x + 8 ? 2x} or 
C. {x|x + 8 < 2x} or 
D. {x|x + 8 < 2x} or 
An isotope of thorium, 227 Th, has a half-life of 18.4 days. How long will it take 78% of the sample to decompose? Round your answer to two decimal places. ?
A. 40.19 days B. 42.08 days C. 41.50 days D. 40.87 days E. 38.05 days
Find the center-radius form of the equation of the circle satisfying the given conditions.Center (-8, 0), radius 9
A. x2 + (y - 8)2 = 9 B. x2 + (y + 8)2 = 9 C. (x + 8)2 + y2 = 81 D. (x - 8)2 + y2 = 81