Solve the equation.
- 
= 4
A. {60}
B. {120}
C. {-120}
D. {-60}
Answer: A
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Find the probability.A bag contains 10 marbles of which 9 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
A. 
B. 
C. 
D. 
Use the discriminant to determine the number and type of solutions of the equation.x2 + 2x + 7 = 0
A. two complex but not real solutions B. two real solutions C. one real solution
Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. open infinite interval; {x|x < -1}; (-?, -1) B. closed infinite interval; {x|x ? -1}; (-?, -1] C. closed infinite interval; {x|x ? -1}; [-1, ?) D. open infinite interval; {x|x > -1}; (-1, ?)
Add.
A. 65 B. 75 C. 74 D. 76