Posted by Roger on Saturday, September 11, 2010 at 11:45am.
A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the United States is f(x)=x+5/2.
a. Use composition of functions to find a function that converts shoe sizes in France to those in the United States. Simplify the function.
b. Determine the shoe size in the United States for a size 38 shoe in France.

Algebra  Sam, Thursday, April 2, 2015 at 9:55am
For f(x)=(3x^2)+5and g(x)=7x2,
a. Verify: g(x + 2) ≠ g(x) + g(2).
b. Find (f – g)(x).
c. Using the resulting function in (b), show that (f – g)(2) = f(2) – g(2).
(The work should be different for each side of the equation.)
d. Is (fg)(0) =(f/g)(0)? Explain.
e. Find (f(x+h)f(x))/h , h ≠ 0.
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