For questions 10–11, find the solutions of the system.
9. y = x² + 3x – 4
y = 2x + 2 (1 point)
A) (–3, 6) and (2, –4)
B) (–3, –4) and (2, 6)
C) (–3, –4) and (–2, –2)
D) no solution

10. y = x² – 2x – 2
y = 4x + 5 (1 point)
A) (–1, 1) and (–7, –23)
B) (–1, 1) and (7, 33)
C) (–1, 33) and (7, 1)
D) no solution

11. If an object is dropped from a height of 144 ft, the function h(t) = –16t² + 144 gives the height of the object after t seconds. When will the object hit the ground? (1 point)
A) 1.5 s
B) 3 s
C) 6 s
D) 9 s

Question

For questions 10–11, find the solutions of the system.
9.   y = x² + 3x – 4
y = 2x + 2  (1 point)
A) (–3, 6) and (2, –4)
B) (–3, –4) and (2, 6)
C) (–3, –4) and (–2, –2)
D) no solution

10.   y = x² – 2x – 2
y = 4x + 5  (1 point)
A) (–1, 1) and (–7, –23)
B) (–1, 1) and (7, 33)
C) (–1, 33) and (7, 1)
D) no solution

11.   If an object is dropped from a height of 144 ft, the function h(t) = –16t² + 144 gives the height of the object after t seconds. When will the object hit the ground?  (1 point)
A) 1.5 s
B) 3 s
C) 6 s
D) 9 s

anonymous · Answer

12.   A ball is thrown into the air with an upward velocity of 28 ft/s. Its height (h) in feet after t seconds is given by the function h = –16t² + 28t + 7. How long does it take the ball to reach its maximum height? What is the ball’s maximum height? Round to the nearest hundredth, if necessary.  (1 point)
A) 1.75 s; 7 ft
B) 0.88 s; 43.75 ft
C) 0.88 s; 17.5 ft
D) 0.88 s; 19.25 ft