Step-by-step explanation:
5×9×12=540
6×9×12÷2=324
324+540=864
Answer:
-7
Step-by-step explanation:
<span>Her travel time to her destination can be found by dividing 50km by 40km/h to get 1.25 hours or 1 hour 15 minutes. He travel time home can be found by dividing 50km by 60km/h to get 0.83 hours or. 50 minutes. The total time was 2.083 hours or 2 hours and 5 minutes. So here average speed is 100 divided by 2.083 hours = 48 miles per hour.</span>
The correct expressions are
-8.8
11(-2)
-6.7
Answer: the width of the uniform path is 9 meters.
Step-by-step explanation:
Let x represent the width of the uniform path.
A pool measuring 18 meters by 22 meters is surrounded by a path of uniform width. It means that the combined length of the pool and the uniform path is (18 + 2x) meters and the combined width of the pool and the uniform path is (22 + 2x) meters.
If the area of the pool and the path combined is 1440 square meters, it means that
(18 + 2x)(22 + 2x) = 1440
396 + 36x + 44x + 4x² = 1440
4x² + 80x + 396 - 1440 = 0
4x² + 80x - 1044 = 0
Dividing both sides of the equation by 4, it becomes
x² + 20x - 261 = 0
x² + 29x - 9x - 261 = 0
x(x + 29) - 9(x + 29) = 0
x - 9 = 0 or x + 29 = 0
x = 9 or x = 29
Since the width cannot be negative, then x = 9 meters
