Solve the equation for the indicated variable.A = 
?r2 for r
A. r = 
B. r = ± 
C. r = 3
D. r = ± 
Answer: B
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Solve the problem.A sample of 200 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 40 years? Round your answer to the nearest whole gram.
A. 0 grams B. 1 gram C. 2465 grams D. 58 grams
Solve the problem.Jim had grades of 96 and 86 on two chemistry tests. What is the lowest score he can get on the third test to maintain an average of 85?
A. 89 B. 91 C. 85 D. 73
Solve the problem.The polynomial 
gives the approximate total earnings of a company, in millions of dollars, where x represents the number of years since 1996. This model is valid for the years from 1996 to 2000. Determine the earnings for 2000. Round your answer to two decimals, if necessary.
A. $2.8 million B. $2.37 million C. $2.56 million D. $2.06 million
Provide the proper response.A student knows that 
= 56. Can 
be found, and if so, what is it?
A. Yes, -56 B. No