Answer:
- Option A
- Speed of plane is 240 km/h, speed of wind is 50 km/h
Step-by-step explanation:
With the tail wind the total speed is the sum of the speeds of plane and wind.
When into wind the total speed is the difference of speeds of plane and wind.
The first equation is
The second equation is
Simplify both equations and solve the system
- r + w = 1740/6 ⇒ r + w = 290
- r - w = 570/3 ⇒ r - w = 190
Solve by elimination, add up the equations
- r + w + r - w = 290 + 190
- 2r = 480
- r = 240
Find the value of w
- 240 + w = 290
- w = 290 - 240
- w = 50
(x-1)/-3 = (x+5)/6
You want to get x by itself. Start by multiplying both sides by -3 and 6:
6(x-1) = -3(x+5)
Distribute:
6x - 6 = -3x + 5
Add 6 and 3x to both sides:
6x + 3x = 5 + 6
9x = 11
Divide both sides by 9 to get x by itself:
x = 11/9
Answer:
When x = 3, use -3x -2
-3(3) - 2 = -9 - 2 = - 11
First convert the feet to inches:
3 feet= 36 in.; 4 feet=48 in.
Make an equation for each one:
Type A: h=36+15x
Type B: h=48+10x
Since the questions wants the heights to be equal, h=h so you can substitute so you have:
36+15x=48+10x
5x=12
x=2 2/5 years or 2.4 years
Answer:
more info please
Step-by-step explanation:
