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
Answer: A
Mathematics
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Convert the number to binary form.162eight
A. 1111010two B. 1110010two C. 1110011two D. 1111011two
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Solve the inequality. Graph your solution on a number line, and write your solution in interval notation.
- 2 > 0
A. (-?, -8) ? (8, ?)
B. 
? 
C. 
D. 
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Find the differential of the function.y = 
A. 
dx
B. 
dx
C. 
dx
D. 
dx
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Write the expression as a logarithm of a single expression. Assume that variables represent positive numbers.4 logbq - logbr
A. logb
B. logb
C. logb(q4 - r)
D. logbq4 ÷ logbr
Mathematics