Solve the problem.When a dead body is discovered, one of the first steps in the ensuing investigation is for a medical examiner to determine the time of death as closely as possible. If the temperature of the medium has been fairly constant and less than 48 hours have passed since death, Newton's law of cooling can be used. Newton's law of cooling states, 
, where k is a constant, T is the temperature of the object after t hours, and TM is the (constant) temperature of the surrounding medium. Assuming the temperature of a body at death is 98.6°F, the temperature of the surrounding air is 69°F, and at the end of one hour the body temperature is 90°F, when will the
temperature of the body be 76°F? Round to the nearest tenth of an hour.
A. 2 hr
B. 0.7 hr
C. 4.2 hr
D. 0.3 hr
Answer: C
Mathematics
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Decide whether the proportion is true or false.
= 
A. True B. False
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Solve.There were 560 people at a school play. The admission price was $2 for adults and $1 for children. The admission receipts were $850. How many adults and how many children attended?
A. 270 adults and 290 children B. 212 adults and 348 children C. 290 adults and 270 children D. 135 adults and 425 children
Mathematics
Determine the rank of the matrix.
A. 3 B. 4 C. 2 D. 1
Mathematics
Solve the problem.How old is a skeleton that has lost 19% of its carbon-14? The decay rate, k, of carbon-14 is 0.01205% per year.
A. 13,782 years B. 1749 years C. 17 years D. 1171 years
Mathematics