明天就要due了Thedemandfunctionforacertainitemisinthousandsofitemsdemandedatapriceofpdollarsperitem.Useintervalnotationtoindicatetherangeofpricescorrespondingtoelastic,inelastic,andunitarypriceelasticityofdemand

Question

明天就要due了
The demand function for a certain item is
in thousands of items demanded at a price of p dollars per item.
Use interval notation to indicate the range of prices corresponding to
elastic,inelastic,and unitary price elasticity of demand.
NOTE:
When using interval notation in WeBWorK,remember
that:
You use 'I' for and '-I' for .
And use 'U' for the union symbol.
a) The range of prices so that demand is elastic is
b) The range of prices so that demand is inelastic is
a) The unit price necessary for unitary elasticity is

Answer 1

这是经济题吧.elastic inelastic unitary price.
interval notation 指 用（A,B）方式表示范围.不用不等式.
关于elastic demand 是 用变化的demand 除 变化price 商大于1的时候
inelastic 就翻一翻.
unitary 指等于1的时候