What is the distance between the points M(–21, –7) and N(–5, –7)? * 14 units
16 units
26 units
28 units

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

step-by-step explanation:

x=6 and x=3

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cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x