Solve the problem.The decay of 989 mg of an isotope is given by 
where t is time in years. Find the amount left after 40 years.
A. 205
B. 410
C. 401
D. 967
Answer: B
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Determine if the given value is a solution to the equation.6
5x + 9 = 3x + 21
A. Yes B. No
The amount of time t (in minutes) a shopper spends browsing in the magazine section of a supermarket is a continuous random variable with probability density function
?
?
?
How much time is a shopper chosen at random expected to spend in the magazine section?
?
A. 
minutes
B. 
minutes
C. 
minutes
D. 
minutes
E. 
minutes
Tell whether the relation is a function.
A. Function B. Not a function
Solve.Alan's yard is rectangular and measures 11.7 meters by 16.3 meters. Maria's yard is rectangular and measures 44.7 meters by 47.6 meters. How much greater is the area of Maria's yard than the area of Alan's yard?
A. 1937.01 m2 B. 19,370.1 m2 C. 2318.43 m2 D. 64.3 m2