Solve the equation. Express irrational answers in exact form and as a decimal rounded to 3 decimal places.
x = 21 - x
A. ln 
- ln 2 ? -0.560
B. 
? 0.838
C. 
? 1.051
D. 
? 1.193
Answer: B
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A. 32 B. 24 C. 70 D. 1,680
Find the distance in the xy-plane between the two points. Round an approximate result to the nearest hundredth.(5, 7) and (15, 31)
A. 24 B. 10 C. 26 D. 4.90
Write the phrase as a variable expression. Use x to represent "a number."A number divided by -20
A. -20x
B. x - (-20)
C. 
D. 
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A. 13n(n + 2)(n - 1) B. 13n(n - 2)(n + 1) C. -13n(n + 2)(n - 1) D. -13n(n - 2)(n + 1)