Solve the problem.A person standing close to the edge on top of a 256-foot building throws a baseball vertically upward. The quadratic equation 
models the ball's height above the ground, s, in feet, t seconds after it was thrown. After how many seconds does the ball reach its maximum height? Round to the nearest tenth of a second if necessary.
A. 2 seconds
B. 1.5 seconds
C. 6.5 seconds
D. 320 seconds
Answer: A
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The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered triple, if possible.
A. (7, -5, z) 
B. (7 - 6z, -5 + 2z, z) 
C. (7 - z, -5 + z, z) 
D. (7 + 6z, -5 - 2z, z) 
Decide whether the pair of lines is parallel, perpendicular, or neither.3x - 6y = 818x + 9y = 7
A. parallel B. perpendicular C. neither
Provide an appropriate response.If a, b, and c are real numbers, is this statement true or false? 
A. True B. False
Find all points where the function has any relative extrema or saddle points and identify the type of relative extremum.f(x, y) = exy
A. Relative maximum at (0, 0) B. Saddle point at (0, 0) C. Relative minimum at (0, 0) D. No relative extrema or saddle points.