Maintenance Month Costs () Jan $440 Feb S690 Mar # Machine Hours (X) 3,000 4,500 8,000 7,000 6,000 9,000 3,500 5,500 $510 Apr May $600 $550 Jun $980 Jul $840 Aug $600 Using the high-low method, what is the b, slope, ty = a +bx) for this set of data? Select one O a 0.9 Ob 0.29 Oc19 d. 0.09 Clear my choice age IA 8 RO