Find the values of x for which the given function is concave up, the values of x for which the function is concave down, and any points of inflection.y = 
x4 - x3 + 12
A. Concave down for 0 < x < 2, concave up for x < 0, x > 2, points of inflection at (0, 12) and (2, 8)
B. Concave down for x < 2, concave up for x > 2, point of inflection at (2, 8)
C. Concave up for 0 < x < 2, concave down for x < 0, x > 2, points of inflection at (0, 12) and (2, 8)
D. Concave up for x < 0, concave down for x > 0, point of inflection at (0, 12)
Answer: A
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Write a fraction in simplified form that expresses the ratio of 0.05 to 0.2. ?
A.
B.
C.
D.
E.
Multiply and simplify any radicals in your answer. Assume that all variables represent positive real numbers.(
+ 
)(
- 
)
A. 
+ 
- 
+ 13
B. 
+ 
- 
- 13
C. 
+ 
+ 
+ 13
D. 
+ 
+ 
- 13
Perform the indicated operation.900 ? 9
A. 8100 B. 8109 C. 909 D. 8091
Solve the equation.
= 
A. {
, 
}
B. 
C. {- 
, - 
}
D. ?