Write the phrase as a variable expression. Use x for the unknown number.The difference of 4 and twice a number
A. 4 - 2x
B. 2x - 4
C. 4 + 2x
D. 2(4 - x)
Answer: A
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Solve the equation. If the equation is an identity or a contradiction, state this.10x - 7 = 50 - 9x
A. x = 57 B. x = -3 C. x = 3 D. x = 43
Complete the square and write the equation in standard form. Then give the center and radius of the circle.x2 + y2 - 6x + 6y + 7 = 0
A. (x - 3)2 +(y + 3)2 = 11
(-3, 3), r = 
B. (x - 3)2 +(y + 3)2 = 11
(3, -3), r = 11
C. (x - 3)2 +(y + 3)2 = 11
(3, -3), r = 
D. (x + 3)2 +(y - 3)2 = 11
(-3, 3), r = 
Solve the gambler's ruin problem.Player A and Player B start with a total of $4. If A starts with $3, what is the probability of ruin for A?
A. 
B. 
C. 
D. 
Provide an appropriate response.Multiply two fractions by 
the numerators and 
the denominators.
A. multiplying; canceling B. adding; multiplying C. multiplying; multiplying D. multiplying; adding