Solve the problem.An experimental model for a suspension bridge is built in the shape of a parabolic arch. In one section, cable runs from the top of one tower down to the roadway, just touching it there, and up again to the top of a second tower. The towers are both 12.25 inches tall and stand 70 inches apart. Find the vertical distance from the roadway to the cable at a point on the road 14 inches from the lowest point of the cable.
A. 2.16 in.
B. 1.76 in.
C. 7.84 in.
D. 1.96 in.
Answer: D
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Solve the equation.
= 9
A. {-15} B. ? C. {-3, 15} D. {3, 15}
Two ships leave the same port at noon. Ship A sails north at 21 mph, and ship B sails east at 12 mph. How fast is the distance between them changing at 1 p.m.? ?
A. 
mph
B. 
mph
C. 
mph
D. 32 mph
E. 24 mph
?Matt E. Matic was applying for a job. To determine whether he could handle the job, the personnel manager sent him out to poll 84 people about their favorite types of TV shows. If you were the personnel manager, why would you not hire Matt on the basis of this survey? His data were as follows: ? ? 36 preferred comedies.47 preferred variety shows.31 preferred serious drama.17 preferred comedies and variety programs.11 preferredvariety and serious drama.4 preferred comedies and serious drama.1 preferred all types.3 did not like any of these TV show types.?
A. ?There were 81 (not 84) polled. B. ?There were 84 (not 84) polled. C. ?There were 83 (not 84) polled. D. ?There were 80 (not 84) polled. E. ?There were 167 (not 84) polled.
Solve.x - y + z = 2x + y + z = -6x + y - z = -12
A. (3, -5, -4) B. (3, -4, -5) C. (-5, 3, -4) D. (-5, -4, 3)