Solve the problem.In the formula A(t) = A0ekt, A(t) is the amount of radioactive material remaining from an initial amount A0 at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.2% annually. Determine the half-life of this isotope, to the nearest year.
A. 151 yr
B. 3 yr
C. 347 yr
D. 250 yr
Answer: C
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Apply Green's Theorem to evaluate the integral.
(7y dx + 5y dy); C: The boundary of 0 ? x ? ?, 0 ? y ? sin x
A. -4 B. -2 C. 4 D. 0
Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. Closure, identity, inverse, and associative only B. All of them C. Closure, identity, associative, and commutative only D. Identity, inverse, and commutative only
Multiply using the lattice method.302 × 51
A. 15,502 B. 15,392 C. 15,402 D. 15,412
Write the fraction.At Smith's Apple Orchard one day, 50 people were picking apples, 23 people were picking pumpkins, and 27 people were picking raspberries. What fractional part of the people were picking either apples or pumpkins?
A. 
B. 
C. 
D. 