Solve the problem.A certain radioactive isotope has a half-life of approximately 950 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 75% of that amount?
A. 394 years
B. 319 years
C. 1900 years
D. 238 years
Answer: A
Mathematics
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Perform the indicated operation. Write the answer in standard form.(7 + 5i)2
A. 24 + 70i B. 49 + 70i + 25i2 C. 24 D. 74 + 70i
Mathematics
Find the product using FOIL.(
- 7)(
+ 5)
A. -1
- 35
B. 
+ 5
- 7
- 35
C. 
- 2
- 35
D. 
- 35
Mathematics
Find the specified domain.For f(x) = 
and g(x) = 
, what is the domain of g ? f?
A. (-?, 0) ? (0, 5) ? (5, ?)
B. (-?, 5) ? (5, ?)
C. (-?, 0) ? (0, ?)
D. (-?, 0) ? 
? 
Mathematics
Factor the expression completely. If the polynomial is prime, state this as your answer.w8 - 16z4
A. (w2 + 4z)(w2 - 4z)(w2 + 2z)(w2 - 2z) B. (w4 + 4z2)(w4 - 4z2) C. (w4 + 4z2)(w2 + 2z)(w2 - 2z) D. (w4 + 4z2)(w2 + 2z)(w - 2z)(w + 2z)
Mathematics