If a = (4, -5) and b = (7, -9), what is the length of ab ? a. 6 units b. 5 units c. 8 units d. 7 units

5 (Answer B)

Step-by-step explanation:

As we move from A to B, x increases by 3 and y decreases by 4.  Apply the Pythagorean Theorem:

(length of AB) = √(3² + [-4]²) = 5 (Answer B)

17 1/3

step-by-step explanation:

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