Answer:
-0.7
Step-by-step explanation:
● -9 + 8.3
Notice that 8.3 = 8 + 0.3
● -9 + (8 + 0.3)
● -9 + 8 + 0.3
-9 + 8 is -1
● (-9 + 8) + 0.3
● -1 + 0.3
-1 is (-0.3 -0.7)
● -0.3 - 0.7 +0.3
● -0.7
Answer:
10 kph
Step-by-step explanation:
Find the speed of the current of the river.
20/(20 - c) + 180/(20 + c) = 8
20(20 + c) + 180(20 - c) = 8(400 - c^2)
8c^2 - 160c + 800 = 0
8(c^2 - 20c + 100) = 0
8(c - 10)^2 = 0
c = 10
The speed of the current of the river is 10 km/hour.
We know 3x16=48
Since there is a minus sign, the answer is -48.
:)
Answer is in the photo. I can only upload it to a file hosting service. link below!
tinyurl.com/wpazsebu
