Answer:
5,000,000 cm
Step-by-step explanation:
1 km=100000cm
we just multiply 50km x 100000,which we get 5 million cm
Answer:

Step-by-step explanation:
Hey there!
To find slope, you take 
In this case
y2: 6
y1: 4
x2: -3
x1: 0
Now we plug in this information

Since this is the slope, you have to add a "x"
So, the slope is 
I believe the answer is C.
Sorry if I'm wrong but I hope this helps.
If you want to find the decimal value of a square root, you can use the 2 closest perfect squares to them.
Example
Approximate the value of sqrt20
Pick the 2 closest perfect squares, one before and one after 20:
16 and 25.
So, the square root of 20 has to be between 4 and 5.
Since 20 is closer to 16 than it is to 25,
We can estimate the decimal value of sqrt20 to be around 4.4