Answer:
20
Step-by-step explanation:
pilot flew a 400-mile flight in 2.5 hours flying into the wind . Flying the same rate and with the same wind speed, the return trip took only 2hours with a tailwind
The speed can be defined as the ratio distance over time, but in this case the pilot is flying at the speed of the plane as well of speed of the wind. We can denote speed of plane as "s" and speed of the wind as "k"
Then the speed of the plane=(s-k) this is because it is moving in the opposite direction of the wind.
But From the question, the plane distance=400mile and the corresponding time =2.5 h
Then the speed of the plane=(s-k) =400mile/2.5
=160mph
By the time it return from trip, the speed the plane flew with is (s+k) because the wind is at the rear.
From the question, the plane distance=400mile and the corresponding time =2 h
Then (s+k)= (400/2)
(s+k)=200mph
I am doing this for points so i can catch up to my brother who is an expert
Answer:
and 
Step-by-step explanation:
The given ellipse has equation:
.
The center of this ellipse is (h,k)=(0,2)
We use the equation: 
to determine the foci.
The directrices are given by 
and 
The equation of the directrices are:
and
The correct answer is D
The sum of the interior angles of a triangle is 180°.
Let's suppose that all 3 angles in the ratio are divisible by a value x.
So the three angles become 1x, 2x and 3x.
1x + 2x + 3x = 180°
6x = 180°
x = 30° [ By dividing both sides by 6 ]
Thus the three angles are: 1x = 30° ; 2x = 2*30 = 60° ; 3x = 3*x = 90°
Hence the smallest angle is 30°.
Answer:
58°
Step-by-step explanation:
65°+57°=122°
180°-122°=58°
