The flight path of a rocket, launched from the ground, is modeled by y = 0.5(20x - x2), where y is the height of the rocket in meters from the ground and x is the time in seconds after it was launched. Find the vertex of the parabola and explain what it represents in terms of the context. O (20, 0); rocket lands at 0 feet after 20 seconds O (10, 50); rocket reaches maximum height of 50 feet after 10 seconds O (10, 50); rocket reaches maximum height of 10 feet after 50 seconds O (20, 0); rocket reaches 20 feet after 0 seconds The circle x2 + 2 - 18x + 8y + 48 = 0 is translated one unit right and two units down. Which is the radius and center of the translated circle? O Center (9, -4); 1 = 7 O Center (9, -4); r= 49 O Center (10, -6); 1= 7 O Center (10, -6); r= 49