What is the distance between -7 and 3? a. 4 b. -4 c. 9 d. 10

Note the number line:

< |||||||||||>
      -7  -6   -5   -4   -3  -2  -1    0    1    2    3  

There is 10 spaces inbetween -7 and 3

This means that D. 10 is your answer

Note that when counting distance between the two  numbers, add them regardless of their sign, and you get your distance.

hope this helps

Side of the square is 20 m

Step-by-step explanation:

Step 1: Find the side of a square with area = 400 m²

Area of a square = (Side)² = 400

⇒ s² = 400

⇒ s = √400 = 20 m