Solve.A water tank can be filled in 5 minutes and emptied in 9 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 28 min
B. 11.25 min
C. 20 min
D. 4 min
Answer: B
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Solve the problem.Robert has built a mechanical model solar system with three balls representing planets at the ends of rods attached to the center representing the sun. The planets are aligned when he turns on the motor. The innermost planet makes a revolution in 18 seconds, the middle planet makes a revolution in 30 seconds, and the outermost planet makes a revolution in 42 seconds. After how many seconds will the planets be aligned again?
A. 945 seconds B. 630 seconds C. 315 seconds D. 1260 seconds
Perform the indicated operation. Simplify, if possible.
- 
+ 4
A. 
B. 
C. 
D. 
Identify the graph of the equation as a parabola, hyperbola, ellipse, or circle.5y2 + 2x = -5
A. hyperbola B. ellipse C. parabola D. circle
Round to the nearest thousand. 213,469
A. 213,000 B. 210,000 C. 212,000 D. 213,500