Find the inverse of the matrix, if possible.
A. 
B. 
C. 
D. No inverse
Answer: B
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Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 1600 years B. 2308 years C. 800 years D. 1400 years
Find the vertex for the parabola whose equation is given.y = x2 + 9x
A. (0, -9)
B. (- 
, - 
)
C. (0, 0)
D. (-9, -81)
Solve. Answer with a complete sentence.Find the area of a rectangle measuring 4.2 yards by 13.71 yards.
A. The area of the rectangle is 17.64 square yards. B. The area of the rectangle is 115.164 square yards. C. The area of the rectangle is 17.91 square yards. D. The area of the rectangle is 57.582 square yards.
Find the unknown number in the proportion. Write your answer as a whole number or a mixed number if possible.
= 
A. x = 
B. x = 7
C. x = 
D. x = 1