Solve.A train leaves a town traveling at a speed of 20 miles per hour. Thirty minutes later another train, traveling at 60 miles per hour, leaves the same town in the same direction on a parallel track. How long will it take this train to catch up?
A. 36 min
B. 40 min
C. 45 min
D. 60 min
Answer: C
Mathematics
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Solve the problem.Find the second derivative of the function y = x8ln x.
A. 56x7ln x + 15x6 B. 8x6ln x + 15x6 C. 56x6ln x + 15x6 D. 56x6ln x + 7x6
Mathematics
Solve the equation. Give the exact solution or solutions.log(4x - 3) = log 9 - log(x - 3)
A. 
B. 
C. 
D. ?
Mathematics
Solve the exponential equation.22x = 216.8
A. 2 B. 8.4 C. 16.8 D. -8.4
Mathematics
Give the symbolic representation for the function f.Function f takes the cube root of x then multiplies the result by 15.
A. f(x) = -15
B. f(x) = 
C. f(x) = f(x) = 
+ 15
D. f(x) = 15
Mathematics