E = 100 V, VR1 = 60 V, and VR2 = 20 V. Find the value of VR4 .
a. 20 V
b. 30 V
c. 40 V
d. 60 V
e. 100 V
c. 40 V
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; g(x) = 
A. {x 
B. {x 
C. {x 
D. {x 
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 decays at a rate of 0.225% annually. Determine the half-life of this isotope, to the nearest year.
A. 3 yr B. 308 yr C. 134 yr D. 222 yr
Solve the equation. Check for extraneous solutions.
A. 
B. 
C. 
D. 
E. 
Solve the system using the substitution method. If the system has no solution or an infinite number of solutions, state this. y = 13 - 3x9y + 2x = -8
A. (5, -2) B. (-5, -2) C. (5, 2) D. (-5, 2)