In this article,we shall explore some techniques of permutations(排列)and combi- nations.This is going to be a slightly long ar- ticle,but is very much educative,and I'll try to cover the entire thing from front to back. You can skip bits if you know them,but
EXAMPLE 1 Determining Wheth- er a Relation Represents a Function. Determining whether the following relation represent functions. (a)For this relation, the domain represents the employee of Saraxvs Pre -Owner Car Mart and the range repre- sents their base salary.
Applied (word) problems do not come in the form"Solve the equation.…"Instead, they supply information using words, a verbal description of the real problem. So, to
Any point P in the XY-plane can then be located by using an odered pair (x,y) of real num- bers.For example,to locate the point whose coordinates are (-3,1),go 3 units along the X- axis to the left of O and then go straight up 1 unit.See Figure2.We plot this point by placing
Each step of a staircase con- tains exactly the same horizontal run and the same vertical rise. The ratio of the rise to the run, called the slope,is increased and the rise remains the same,the staircase becomes less steep.
A circle is a set of points in the xy- plane that hare a fixed distance r from a fixed point(h,k).The fixed distance r is called the radius,and the fixed point (h,k)is called the center of the circle.
Polynomial functions are among the sim- plest expressions in algebra.They are easy to evaluate:only addition and repeated multipli- cation are required.Because of this,they are often used to approximate other more compli-
Ten Montana hunters are in a duck blind when 10 ducks fly over.All 10 hunters pick a duck at random to shoot at,and all 10 hunters fire at the same time.How many ducks could be expected to escape,on average。
