Solve. Provide answers in interval notation.x2 + 10x + 24 > 0
A. (-6, -4)
B. (-4, ?)
C. (-?, -6)
D. (-?, -6) ? (-4, ?)
Answer: D
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Find the principal unit normal vector N for the curve r(t).r(t) = (9t sin t + 9 cos t)i + (9t cos t - 9 sin t))k
A. N = - 
(cos t)i - 
(sin t)k
B. N = (cos t)i - (sin t)k
C. N = (-sin t)i - (cos t)k
D. N = (sin t)i + (cos t)k
Solve the problem.A musician plans to perform 5 selections for a concert. If he can choose from 7 different selections, how many ways can he arrange his program?
A. 35 B. 21 C. 16,807 D. 2520
Solve the problem.In one U.S. city, the quadratic function 
models the median, or average, age, y, at which men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1961, 23.5 years old B. 1961, 50.4 years old C. 1953, 36 years old D. 1936, 50.4 years old
Write out the first five terms of the sequence.{sn} = 
A. s1= 
, s2= 
, s3= 
, s4= 
, s5= 
B. s1= 
, s2= 
, s3= 
, s4= 
, s5= 
C. s1= 
, s2= 
, s3= 
, s4= 
, s5= 
D. s1= 
, s2= 
, s3= 
, s4= 
, s5= 