Solve the problem.A ball is thrown upward with an initial velocity of 21 meters per second from a cliff that is 
high. The height of the ball is given by the quadratic equation 
where h is in meters and t is the time in seconds since the ball was thrown. Find the time it takes the ball to hit the ground. Round your answer to the nearest tenth of a second.
A. 7.6 sec
B. 7.3 sec
C. 7.0 sec
D. 10.3 sec
Answer: B
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Determine whether the graph of f opens upward or downward and whether the graph is wider, narrower, or the same as the graph of 
Find the axis of symmetry and the vertex. Find the y-intercept and any x-intercepts. Sketch a graph of f.f(x) = - 
x2 - x + 4
What will be an ideal response?
Solve the problem.Draw a scatterplot of the given data. Find the equation of the line containing the points 
and 
Graph the line on the scatterplot.
A. y = -2.04x + 12.38
B. y = -2.24x + 12.88
C. y = -1.81x + 11.34
D. y = 2.04x + 12.38
Provide the proper response.Without graphing, justify why x2 + 4 - 4x - 12y + 60 = 0 is the equation of a parabola.
What will be an ideal response?
Convert the units using unit fractions.84 qt = 
gal
A. 168 B. 336 C. 21 D. 42