Parter Inc., operates a local parcel delivery service. The company keeps detailed records relating to operating costs of trucks, and has found that if a truck is driven 1100 miles per year the operating cost is $11500 . This cost increases to $36000 if a truck is driven 6000 miles per year.Estimate the cost formula for truck operating costs using the high-low method.Variable cost per unit is____.
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ParterInc., operates a local parcel delivery service. The company keeps detailed records relating to operating costs of trucks, and has found that if a truck is driven 450 miles per year the operating cost is $3800 . This cost increases to $3280 if a truck is driven 320 miles per year.Estimate the cost formula for truck operating costs using the high-low method.Fixedcost is____.
Matlab提供的ODE求解器中大部分场合的首选方法是:
A. ode45
B. ode23
C. ode15s
D. ode23s
利用中心差商公式计算函数微分时,步长h越小越好
A. 对
B. 错
认知老年人活动的相关理论包括
A. 马斯洛需求层次理论
B. 认知角色理论认知社会重建理论
C. 认知活动理论
D. 认知现代化理论