it will take 4 minutes for their drone to fly 7 kilometers. How long will it take the drone to fly 21 kilometers?

12 minutes

Step-by-step explanation:

You have to think about this as if it were a fraction where it is

4 minutes                  x minutes

and      

7 kilometres             21 kilometres

As you can see on the bottom row you can divide the 21 kilometres and the 7 kilometres to see what it took to get there and if you were to do that it would be 3. So now that we have the 3 we are going to multiply that by the 4 minutes so that we can see how many minutes it would take for 21 kilometres and the answer is...

3 x 4 = 12

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

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