[微積] 2題應用題
有關於differentials
1.The relationship between Cunnuinggham Realty's quarterly profits,P(x),and
the amount of money x spent on advertising per quarter is described by the
function
P(x)=-1/8x^2+7x+30(0<跟等於x<跟等於50)
2. A study prepared for the National Association od Realtors estimates that
the number of housing starts per year over the next 5yr will be
N(r)=7/1+0.02r^2
millon unit .where r(percent)is the mortgage rate.Use differential to
estimate the decrease in the number of housing starts when the mortgage rate
is increased fronm 12%to 12.5%
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 210.70.167.173