3. An acrobat landed on a teeterboard and launched his partner into the air. The graph below shows the height h of the partner, in yards, at t seconds after the launch.

   

   Which value is the best approximation of the maximum height of the partner?

   1. 6.0 yards
   2. 6.4 yards
   3. 6.8 yards
   4. 7.2 yards

4. The bacteria in a petri dish are growing exponentially with time, as shown in the table below.

   Bacteria Growth

   Day	Bacteria
   0	50
   1	150
   2	450

   Which of the following equations expresses the number of bacteria y present at day x?

   6. y = ( 3 ) x y equals . open 3 close to the x
   7. y = 50 + ( 3 ) x y equals 50 plus . open 3 close to the x
   8. y = 50 · ( 3 ) x y equals 50 middle dot . open 3 close to the x
   9. y = 150 · ( 3 ) x y equals 150 middle dot . open 3 close to the x
5. A truck driver traveled 120 miles in 2.5 hours. How far can he drive in 2 hours?
   1. 48 miles
   2. 72 miles
   3. 96 miles
   4. 144 miles

6. Alexandra dives from a 30-foot board into a swimming pool. The graph below shows her height h, in feet, t seconds after jumping.

   

   After leaving the board, in how many seconds is Alexandra at the height of 30 feet again?

   6. 0.5 second
   7. 1 second
   8. 1.5 seconds
   9. 2 seconds

7. What is the standard form of the equation of the conic section given below?

   25 x 2 − 49 y 2 − 1225 = 0 25 x squared , minus , 49 y squared , minus , 1225 , equals 0

   1. x 2 49 − y 2 25 = 1 fraction x squared , over 49 end fraction , minus , fraction y squared , over 25 end fraction , equals 1
   2. x 2 49 + y 2 25 = 1 fraction x squared , over 49 end fraction , plus , fraction y squared , over 25 end fraction , equals 1
   3. 25 x 2 − 49 y 2 = 1225 25 x squared , minus , 49 y squared , equals , 1225
   4. 49 x 2 − 25 y 2 = 1 49 x squared , minus , 25 y squared , equals 1

8. Owen threw a ball straight up into the air from an initial height of 5 feet. The graph below shows the height h of the ball, in feet, at t seconds after Owen threw it. Of the following times, when was the ball closest to the ground?

   

   6. 0.6 second
   7. 1 second
   8. 1.6 seconds
   9. 2 seconds

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