A plane can fly 475 miles against the wind in the same amount of time that it can fly 675 miles with the wind. If the wind speed
1 answer:
Answer:
230 mph
Step-by-step explanation:
Let speed of plane in still air be x. Therefore, when against the wind speed, the resultant speed is x-40 mph. Equally, when with the wind speed, the resultant speed is x+40 mph. The time is the same hence we can express these as
By cross multiplication
675(x-40)=475(x+40)
675x-27000=475x+19000
200x=46000
X=46000/200=230 mph
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Answer:
1 seconds after being thrown, the stone reaches its max height
Step-by-step explanation:
The parabolic (quadratic) equation is:
Lets expand this in the form , so we have:
We can say the values of a,b, and c, now to be:
a = -5
b = 10
c = 40
The number of seconds at which the max would occur is given by the point, x, at:
We know a and b, let's find the seconds, x,
Hence,
1 seconds after being thrown, the stone reach its max height
First of all, it is 2r
and it would be divide by 3.14 (pi) and then you should have the diameter. Then divide by 2 to find radius.