Answer:
The speed of the airplane in still air is 550 mph.
The speed of the wind is 50 mph.
Step-by-step explanation:
speed = distance / time
distance = speed * time
or simply
d = st
Let v be the speed of the airplane with no wind.
Let w = speed of wind
With the wind:
d = 1800; s = v + w; t = 3
1800 = 3(v + w)
Against the wind:
d = 1800; s = v - w; t = 3.6
1800 = 3.6(v - w)
We have a system of two equations:
3(v + w) = 1800
3.6(v - w) = 1800
Divide both sides of the first equation by 3. Divide both sides of the second equation by 3.6.
v + w = 600
v - w = 500
Add the equations.
2v = 1100
v = 550
The speed of the airplane in still air is 550 mph.
v + w = 600
550 + w = 600
w = 50
The speed of the wind is 50 mph.
To solve this, divide the numerator by the denominator.
3 ÷ 25 = 0.12
So,
in decimal form is:
0.12
9 x 20 = 180
4(2x 2) = 16
180+16 = 196
answer
area of figure = 196
Answer: question 6
4/7*8/10 =
first multiply the numeratores the the denominatos.
4*8=32 so this will be numerator.
7*10=70 this is denominator.
so answer is 32/70
same way question 7 is 28/40
question 8
11/2 *9/4 = 99/8= 12 3/8
question 9
convert to improper
9/5*7/3= 63/15 4 3/15
question 10
21/8*16/7= 336/56= 6/6
Step-by-step explanation: