Solve the problem.A sample of 800 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 10 years? Round to the nearest whole gram.

A. 1 gram
B. 800 grams
C. 9 grams
D. 605 grams


Answer: D

Mathematics

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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = -4 + 11 cos tFind the body's speed at time t = ?/3 sec.

A. -  m/sec
B.  m/sec
C.  m/sec
D. -  m/sec

Mathematics

Solve the problem.Let the number of gallons G of water drained from a pool after t hours be given by  for   (i) Find G(t + h).   (ii) Find the difference quotient. Interpret your result.

A. (i) 3125 - 125t + h (ii) 1; the pool is being emptied at a constant rate of 1 gal/hr. B. (i) 3125 - 125t + 125h (ii) -125; the pool is being emptied at a constant rate of 125 gal/hr. C. (i) 3125 - 125t - 125h (ii) -125; the pool is being emptied at a constant rate of 125 gal/hr. D. (i) 3125 - 125t + 125h (ii) 125; the pool is being emptied at a constant rate of 125 gal/hr.

Mathematics

Multiply.  0.06

A. 0.12 B. 0.0012 C. 1.2 D. 0.012

Mathematics

Solve the problem.In a survey about the number of siblings of college students, the following probability table was constructed:   What is the probability that a student has less than 2 siblings?

A. 0.56 B. 0.2 C. 0.76 D. 0.24

Mathematics