Use a graphing calculator to graph the equation and identify the x-intercepts. If your answers are not exact, round to the nearest tenth.y = -2.5x2 + 8.9x - 1.5
A. x-intercept: (0, -1.5)
B. x-intercept: (1.8, 6.4)
C. x-intercepts: (-3.7, 0) and (0.2, 0)
D. x-intercepts: (0.2, 0) and (3.4, 0)
Answer: D
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Solve.2x - 6 = 3(x + 9)
A. 33 B. -21 C. 21 D. -33
Solve the problem.A racetrack curve is banked so that the outside of the curve is slightly elevated or inclined above the inside of the curve. This inclination is called the elevation of the track. The maximum speed on the track in miles per hour is given by
where r is the radius of the track in miles and ? is the elevation in degrees. Find the maximum speed for a racetrack with an elevation of 26° and a radius of 
Round to the nearest mile per hour.
A. 37,953 mph B. 59,899 mph C. 193 mph D. 171 mph
The chart shows the number of research articles in the prominent journal Physics Review that were written by researchers in Europe during 1983 - 2003 (
represents 1983).
?
?
Which of the following logistic functions best models the data? (?t is the number of years since 1983.) Try to determine the correct model without actually computing data points.
?
(A)
?
(B)
?
(C)
?
(D)
?
__________
?
According to the model you selected, at what percentage was the number of articles growing around 1984?
?
__________%
What will be an ideal response?
x² = –16y
Locate the focus.