SOLUTION: Each employee has a seperate telephone line. The company is studying the possible number of telephone calls that can be made from people in the office to other people in the offic

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Each employee has a seperate telephone line. The company is studying the possible number of telephone calls that can be made from people in the office to other people in the offic      Log On


   

Question 15511: Each employee has a seperate telephone line. The company is studying the possible number of telephone calls that can be made from people in the office to other people in the office. They have discovered that the total number of possible telephone calls T is described by the equation T = 0.5(x^2-x), where x is the number of people in the office. If 45 people are presently employed at the office, how many possible telephone calls can be made between these 45 people?
Answer by pwac(253) About Me  (Show Source):
You can put this solution on YOUR website!
If number of people in office is 45 just substitute x=45
in your given equation
T=0.5%2845%5E2-45%29Do sum in brackets first:
T=0.5%281980%29 Multiply figure in brackets by 0.5 or divide by 2
it means the same to give:
T=990
Pete