Answer: speed of plane is 69/miles per hour
Speed of wind is 23 miles per hour
Step-by-step explanation:
Let x represent the speed of the plane.
Let y represent the speed of the wind.
A plane traveled 1012 miles each way to Warsaw and back. The trip there was with wind. It took 11 hours.
This means that the speed is x+y miles/hour. Therefore
1012 = 11(x+y)
1012 = 11x + 11y - - - - - - - - 1
The trip back was into wind. The trip back took 22 hours.
Since it flew against the wind, the speed would be x-y km/hour
Distance = speed × time. Therefore
1012 = 22(x - y )
1012 = 22x - 22y
Dividing through by 2
506 = 11x - 11y- - - - - - - - - 2
Adding equation 1 and equation 2, it becomes
1518 = 22x
x = 1518/22 = 69
Substituting x = 69 into
1012 = 22(x - y )
x - y = 1012/622= 46
y = 69 - 46 = 23
Answer:
width = 8, length = 42
Step-by-step explanation:
Let x = width, then length = 4x+10.
A = l x w
336 = x(4x+10) put into standard form
4x2 + 10x - 336 = 0 divide by 2
2x2 + 5x - 168 = 0 and solve using the quadratic formula and get
-21/2 and 8, the neg answer will not work, so the width = 8, length = 42
Equations -
I like to find the decimal expression of the fractions, to make this easier.
Divide each sides by 0.6
Answer: 6/7
Answer:
FUNCTIONNNNN
Step-by-step explanation:
Hi there.
To start, we have to understand where the ten the place is.
Hint: it's 1 place behind the decimal point.
Now we need to know what numbers behind the tenths place make it round up or down.
If the number behind it is 4 or under, round down.
5 & up, round up.
In this case, 830.248 has 2 numbers behind the decimal, so we have to round those THEN the 2 in the tenths place.
830.25 to 830.3
Your answer is D. 830.3
I know this was lengthy, sorry. Just wanted to explain :p
