12. Let H represent the height of an airplane above the ground in feet (ft) and 15 represent the time in minutes (min) since the plane began descending to the ground. The airpiane starts descending from 30, 000 feet at a rate of 40 ft per second. Assume the pEane continues at the same rate of descent. What is the domain of the function representing H as a function of t? (A) DH = [O0,0] (B) DH = [0,125] (C) DH = [37.5, 0] z (D) DH = [0, 750] _ (E) DH = [0, 30, 000] _ __- 14. The equation of the straight line passing through the points (2, 3) and (6, 1) is 1 7 (A)y=25:+5 (B)y=--;1l-:c+g (19313323 (D)y=l3\" (E) y = 21%; :_ : 15. A firm selling tinned caviar finds that the total cost in dollars of producing and selling ac cans is given by C(32) = 7:1: + 30. The firm charges $10 per can. What is the breakueven quantity? (A) 3 cans (B) $10 (C) $15 (D) 10 cans (E) The firm will never break-even tug}! ::'*"- 16. A ball is thrown in the air from the top of a building. Its height h, in meters above ground, as a function of time t, in seconds, is given by h(t) = 4t2 + 241; + 8. Then the ball reaches ? (A) a maximum height of 43 metres after 2.5 seconds (B) a maximum height of 44 metres after 3 seconds (C) a maximum height of 37 metres after 3 seconds - \"5.5:: (D) a maximum height of 32 metres after 2 seconds \"*'2. .411; (E) a maximum height of 10 metres after 4 seconds t-i: _ *1\" =