Answer:
2x+9=12x-21
-2. -2
9=10x -21
+21 +21
30=10x
Divide by 10 on both sides
30/10
x=3
Step-by-step explanation:
Hello there! Thank you for asking your question here at Brainly! I will be assisting you today with answering this problem, and will teach you how to handle it on your own in the future.
First, let's take a look at our problem.
"The speed of a ship is given by D3, where D is the distance the ship travels in 3 hours. If the ship travels 48 miles in 3 hours, what is the speed of the ship?"
To solve for this, we need to understand the formula for speed.
The formula for speed is:
Speed = 
Now that we have our formula, let's
define our variables.
So, we have our distance, 48 miles, and our time, 3 hours.
Let's
plug in these numbers to the formula.
Speed =
Simplify the fraction to get the speed.

= 16.
Your final equation is:
Speed = 16.
Our final answer is
16 mph.I hope this helps!
The length of the arc of the circle with a radius of 2 ft and the angle made at the centre equal to
is 10.5ft.
<h3>What is the length of the arc of a circle?</h3>
The length of the arc of a circle is equal to the product of the circumference of the circle and the ratio of the angle made by the arc of the circle to 2π. It is given by the formula,

It is given that the radius of the circle is equal to 2 ft while the angle made by the arc at the centre of the circle is equal to
. And we know the formula for the length of the arc, therefore, the length of the arc,


Hence, the length of the arc of the circle with a radius of 2 ft and the angle made at the centre equal to
is 10.5ft.
Learn more about the Length of the Arc of a Circle:
brainly.com/question/1577784
The answer is A. y < -2x + 4 and y > 3x - 4.