曲线x=3cost,y=sint曲率最大值为;

设r(t) =(3cost，3sint, 4t)，则|r(t)|=

What is the total cost in this outcome (Firm A's total cost + Firm B's total cost)?What is the total cost in the efficient outcome (assuming that the price is $3 and four units are produced in total)?<br/>______

中国大学MOOC:设r(t)=(3cost，3sint,4t)，则|r(t)|=

向量函数r(t)=(3cost，3sint,0)关于t的旋转速度等于

Fixed Cost，Veriable Cost，Explicit Cost，Implicit Cost，Opportunity Cost，Sunk Cost，Economic Profit，Normal Profit，Average Cost，Margial Cost

Three cost drivers are used to estimate the cost of processing insurance claims. The cost drivers are: (1) claim amount, (2) age of vehicle in accident and (3) age of driver in accident. The percentages attributable to the cost drivers are 50% for claim amount, and 15% for each of the other two cost drivers. What is the cost to process Claim #101? The claim amount is $1,000. The age of the vehicle is 5 years. The age of the driver is 20 years.

Make questions about the underlined words.The painting cost £3,000.____ ____ ____ the painting ____ ?

中国大学MOOC: The cost of these planes is $3 million, _________ the $ 2 million charged by their competitors.

This book______me twenty dollars. A: is cost B: was cost C: cost D: have been cost