For functions that model practical phenomena, the variables involved often have units associated with them.
Answer the following statement true (T) or false (F)
True
Mathematics
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Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 700 pounds of the material are placed in the vault, how much time will need to pass for only 431 pounds to remain?
A. 80 yr B. 140 yr C. 70 yr D. 75 yr
Mathematics
Verify the identity.tan (x - ?) = tan x
What will be an ideal response?
Mathematics
Find the phase shift.y = -3 cos(8x + ?)
A. 
units to the left
B. 8? units to the right
C. 3? units to the right
D. 
units to the left
Mathematics
Solve the equation.x2 = -4
A. ±
B. ±2
C. ±i
D. ±2i
Mathematics