Solve the problem.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height?
A. 42 s
B. 21 s
C. 10 s
D. 31.5 s
Answer: B
Mathematics
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Evaluate the expression.3-2
A. -9
B. 9
C. 
D. 
Mathematics
Change the logarithmic expression to an equivalent expression involving an exponent.ln x = 3
A. e3 = x B. ex = 3 C. x3 = e D. 3e = x
Mathematics
Solve the equation.2 ln 4x = 12
A. 
B. {e6}
C. 
D. 
Mathematics
Write an equivalent expression without negative exponents and, if possible, simplify. 
A. 
B. 38
C. - 38
D. - 
Mathematics