What is the distance between -9,-7 and -2, -2

The distance between -9,-7 and -2,-2 is 7,5.

Step-by-step explanation:

[-9] - [-2] = 7

[-7] - [-2] = 5

            =   7,5

Hope this helps and have a great day!

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870