Solve the problem by integration.Under specified conditions, the time t (in min) required to form x grams of a substance during a chemical reaction is given by 
Find the equation relating t and x if x = 0 g when 
A. t = 
ln 
- 
ln 
B. t = 
ln 
+ 
ln 
C. t = 
ln 
+ 
ln 
D. t = 
ln 
- 
ln 
Answer: A
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Find all cube roots of the complex number. Leave answers in trigonometric form.-125
A. 5 cis 180°, 5 cis 0° B. 5 cis 60°, 5 cis 180°, 5 cis 300° C. 5 cis 120°, 5 cis 180°, 5 cis 300° D. 5 cis 30°, 5 cis 150°, 5 cis 270°
Evaluate each expression without using a calculator. Give the result in degrees.cos-1 (0)
A. 0° B. 90° C. 45° D. 180°
Solve the problem.The quadratic function 
models the median, or average, age, y, at which U.S. men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1956, 24.3 years old B. 1936, 49.6 years old C. 1953, 36 years old D. 1956, 49.6 years old
A solution is an acid if its pH is less than 7 and a base if its pH is greater than 7. The pH is defined by 
where [H+] is the concentration of hydrogen ions in the solution. Use this information to answer the question.A mixture has a pH of 5.1. Find the concentration of hydrogen ions [H+] in the mixture. Is the mixture an acid or a base?
A. 105.1, acid B. 10-5.1, acid C. 10-5.1, base D. 105.1, base