Solve.How many different three-digit numbers can be written using digits from the set {3, 4, 5, 6, 7} without any repeating digits?
A. 20
B. 120
C. 10
D. 60
Answer: D
Mathematics
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For the smooth curve r(t), find the parametric equations for the line that is tangent to r at the given parameter value 
r(t) = (4t2 - 4t)i + (t + 9)j + k ; t0 = 2
A. x = 8 + 12t, y = 11 + t, z = 1 B. x = 8 + 12t, y = 11 + t, z = 0 C. x = 12t, y = t, z = t D. x = 8 + t, y = t, z = t
Mathematics
Find the requested value.f(x) = -2x - 4, g(x) = -4x2 - 5x - 1Find 
(3).
A. - 
B. 
C. 
D. 
Mathematics
Divide, if possible. If not possible, write "not defined."
A. 27 B. 24 C. 24 R7 D. 24 R3
Mathematics
Provide an appropriate response.In a certain city, the subway system carried a total of 1,670,000,000 passengers. Write 1,670,000,000 in scientific notation.
A. 1.67 × 108 B. 1.67 × 1010 C. 16.7 × 109 D. 1.67 × 109
Mathematics