Concept:The distance between two points is found using the distance formula.Explanation:Let M(−3,8) and N(5,−7).The distance formula is ∣MN∣=(x2−x1)2+(y2−y1)2.Substitute x1=−3, y1=8, x2=5, y2=−7:∣MN∣=(5−(−3))2+(−7−8)2=(5+3)2+(−15)2=82+225=64+225=289=17 unitsAnswer:∣MN∣=17 units