Graph the equation.y2 = 20x
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem. Round your answer, if appropriate.As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 5 cm × 2 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.6 cm/s and the width of the image is changing at 0.1 cm/s.
A. 1.7 cm2/sec B. 6.4 cm2/sec C. 3.2 cm2/sec D. 3.4 cm2/sec
Solve the problem.Suppose that the x-intercepts of the graph of y = f(x) are 9 and 2. What are the x-intercepts of 
A. 63 and 14 B. 2 and -5 C. 9 and -5 D. 16 and 9
Solve the problem.A projectile is fired from a cliff 300 feet above the water at an inclination of 45° to the horizontal, with a muzzle velocity of 300 feet per second. The height h of the projectile above the water is given by 
where x is the horizontal distance of the projectile from the base of the cliff. How far from the base of the cliff is the height of the projectile a maximum?
A. 703.13 ft B. 1,003.13 ft C. 2,409.38 ft D. 1,406.25 ft
Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = -3x2 + 30x + 225
A. Increasing on (-5, ?); decreasing on (-?, -5) B. Increasing on (-?, 0); decreasing on (0, -?) C. Increasing on (-?, 5); decreasing on (5, -?) D. Increasing on (-?, -5); decreasing on (-5, -?)