Provide an appropriate response.The line that divides the parabola into two symmetrical halves is called the _____ of the parabola.
A. vertex
B. axis of symmetry
C. x-intercept
D. y-intercept
Answer: B
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Factor the trinomial by grouping.
?
?
A. 
B. 
C. 
D. 
E. 
Find the requested value.
f(6) for f(x) = 
A. 21 B. -27 C. 6 D. 5
Solve the problem.A ball is tossed upward. Its height after t seconds is given in the table. 
Find a quadratic function to model the data. Use the model to determine when the ball reaches its maximum height, as well as the value of the maximum height.
A. The ball never reaches a maximum height. B. The ball reaches a maximum height of 40 feet in 1.5 seconds. C. The ball reaches a maximum height of 44.6 feet in 1.6 seconds. D. The ball reaches a maximum height of 50 feet in 2.1 seconds.
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are:Between 15.2 and 16.1 seconds
A. 13.5% B. 34% C. 68% D. 50%