The histogram shows the scores of each participant in a game from a total of 100 participants. 
The greatest number of participants is within which category?
A. 80-99
B. 60-79
C. 60-69
D. 40-59
Answer: B
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 1 for r(t) = (4t2 + 3t + 7)i - 6t3j + (7 - t2)k
A. v(1) = 7i - 6j - 1k B. v(1) = 11i + 18j + 2k C. v(1) = 5i - 18j - 2k D. v(1) = 11i - 18j - 2k
Mathematics
Solve the problem.In how many ways can a group of 7 students be selected from 8 students?
A. 56 B. 7 C. 1 D. 8
Mathematics
Solve the problem.The drop in voltage, E, across two terminals in an electrical circuit using alternating current, is described by the equation 
where t is time in seconds. Find the maximum voltage drop.
A. 109 B. 58 C. 69 D. 18
Mathematics
Simplify the root. 
A. - 
B. 
C. x5
D. -x5
Mathematics