Use < or > for ? to write a true sentence. Draw a number line if necessary.0 ? 29
A. >
B. <
Answer: B
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Determine whether the given set is empty.{x | x is a person who owned a laptop computer before 1970}
A. Empty B. Not empty
The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.r(t) = (6t2 + 5)i + (4t3 - 3t)k
A. 
B. 
C. 0
D. ?
Solve the equation by factoring.49x2 + 84x + 27 = 0
A. 
B. 
C. 
D. 
A solution is an acid if its pH is less than 7 and a base if its pH is greater than 7. The pH is defined by 
where [H+] is the concentration of hydrogen ions in the solution. Use this information to answer the question.The concentration of hydrogen ions in a solution is approximately 10-7.6. What is the pH of the solution? Is the solution an acid or a base?
A. The pH is 7.6. The solution is an acid. B. The pH is -7.6. The solution is a base. C. The pH is -7.6. The solution is an acid. D. The pH is 7.6. The solution is a base.