(b) recall that for d c x, the image of d under f is the set f (d) = {f(x) e y |x € x}. let a, b c x prove that f(an b) c f(a) n f(b). find an example of a function f and sets a and b such that f(an b) but f(a)n f(b)ø

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.