Speed of the boat = u
speed of the current = v
in downstream,
u - v = 105/5
u - v = 21
in upstream
u + v = 105/7
u + v = 15
add both equations
2u = 36
u = 18
v = -3
so
speed of the boat = 18 km/h
speed of the current = 3 km/h
Well first, you have to put them together.
5X - 2 = 4X + 2 Then we have to combine like terms.
X = 0 Now we have solved for X. Hope this helped!
-Twix
Answer:
A = 150°
Step-by-step explanation:
In the parallelogram ABCD, A and D are adjacent angles.
We know that in a parallelogram, adjacent angles are supplementary.
Therefore,
A + D = 180° --- (1)
But, it is given that angle A is 5 times angle D.
So, A = 5D
Substitute in (1), we get,
5D + D = 180
6D = 180
D = 30
A = 5D
= 5(30)
= 150
Hence, A = 150°
The rest of the question: What is the area?
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The area of the parallelogram = base × corresponding height
The base = 9 units
corresponding height = 2/3 units
<u>So, Area = 9 × 2/3 = 6 units</u>