Answer:
6
Step-by-step explanation:
First, multiply both sides by 3.
Next, combine like terms.
Solve for x.
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Answer:
Plane speed is 60 miles/hour
Wind speed is 20 miles/hour
Step-by-step explanation:
Lets suppose the speed of the plane in still air is s and speed of the wind is w and since speed in the formula below equals speed of the plane plus the wind's speed so speed=s+w for this journey with the wind
For the first journey the trip with the wind:
Here we got our first equation for the second equation we use the information from the second trip which was into the wind. Which means the speed here would be speed=s-w
so now we got our two equations adding both equations would result into the following:
so speed of the plane is 60 miles/hour put the value of s in any our two equations to calculate the wind speed, lets take the first equation:
so the wind speed is 20 miles/hour
Answer:
A. a = 2s - b -c
Step-by-step explanation:
Rearrange the equation in a way that you have only a on one side. When solving equations you can add, subtract, multiply or divide by the same number/variable/expression on the both sides.
Multiply by 2 to get rid of the fraction.
On the right side the 2 cancels out:
On the right side next to a are still b and c. But we want a alone. Subtract b.
b - b on right side gives 0.
The step above is usually skipped, because number + 0 = number.
Next to a there is still c. Subtract c.
c - c on the left is 0.
So our answer is:
It can be rewritten to (change sides):
And s · 2 can be rewritten to 2s: