A projectile is launched at a height of h feet above the ground at an angle of 
with the horizontal. The initial velocity is 
feet per second, and the path of the projectile is modeled by the parametric equations ![]()
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Select the correct graph of the path of a projectile launched from ground level at the value of and .
?
feet per second
?
A. ?
B. ?
C. ?
D. ?
E. ?
?
Answer: D
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A reflector for a satellite dish is parabolic in cross section, with the receiver at the focus F. The reflector is 3 ft deep and 40 ft wide from rim to rim (see the figure). How far is the receiver from the vertex of the parabolic reflector? 
?
?
Round to the nearest foot, if necessary. Enter your answer as a number without the units.
Fill in the blank(s) with the appropriate word(s).