Let the profit made in 1998 be $y In 2003, profit is: y ( 1-10%)( 1-10%)( 1-10%)( 1-10%)( 1...
Let P people arrived in the cinema t minutes since 9:00... a people arrived in t minutes, the number...t) dt - 5t + 25 Therefore, let F(t) be the number of...
(a) let profit be x in 2010, {profit in 2011 :x(1-12%) profit in 2012 : x(1-12%)(1-12%) profit in 2013 : x(1-12%)^2 (1+10%) profit in 2014 : x(1-12%)^2 (1+10%)(1+10%) pforfit in 2015: x(1-12%)^2 (1+10%)(1+10%)(1+10%)= $5000000} {}內的內容可以不寫，你可直接...
let 's the mass of A and B be x and y respectively x+y=1800--(1) [120x/100+84y/100]=1800(100/100) (120x+84y)=180000--(2) 120(1800-y)+84y=180000 216000-120y+84y=180000 y=1000 gram so x=800 gram A has 800 gram,B has 1000 gram//
... on consecutive contour lines. Let the difference in height between every two consecutive contour lines...helicopter is 36.72 m above the deck 5. Let the height of the lighthouse be x m Let the...
Let x be speed of car A. Speed of car B = 5 + 5/7×...
Let x be the number of correct answer she got, and y be the number...
Using the result in (b). Let x = A and n = 2012, we get A^2012 = f(A)g(A) + pA...
