Round the whole number to the given place value.2159 to the nearest thousand
A. 3000
B. 1900
C. 2000
D. 2100
Answer: C
Mathematics
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Use the addition formulas to derive the identity.cos 
= -sin x
What will be an ideal response?
Mathematics
Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 1400 years. How many years would be required for a given amount of this isotope to decay to 45% of that amount?
A. 1568 years B. 1613 years C. 770 years D. 1207 years
Mathematics
Add. Do not use a number line except as a check.- 
+ 
A. - 
B. 
C. - 
D. 
Mathematics
Determine whether the statement is True or False.21 < -16
A. False B. True
Mathematics