Determine whether the given equation is an identity.5x - (1 - x) + 4x + 1 = 10x + 5
A. Yes
B. No
Answer: B
Mathematics
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The matrix associated with the solution to a system of linear equations in x, y, and z is given. Write the solution to the system, if it exists.
A. x = -4, y = 4, z = 0 B. x = 0, y = 4, z = -4 C. x = 4, y = 4, z = -4 D. x = -4, y = 0, z = 4
Mathematics
Divide.
A. 
- 
i
B. 
+ 
i
C. - 
- 
i
D. - 
+ 
i
Mathematics
Solve. x - y + 3z = -102x + z = -3 x + 3y + z = 0
A. (-3, 0, 1) B. (-3, 1, 0) C. (0, -3, 1) D. (0, 1, -3)
Mathematics
Solve the problem.A certain radioactive isotope decays at a rate of 0.15% annually. Determine the half-life of this isotope, to the nearest year.
A. 201 yr B. 5 yr C. 462 yr D. 333 yr
Mathematics