How many telephone numbers are there in the 509 area code? telephone numbers may not start with the number 0 or 1. they also must not begin with 911 or 555. do not consider other special circumstances.

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio

Norder to get a certain shade of blue paint, a mixer must have 5 parts white paint to 3 parts blue. if 4 gallons of paint must be mixed, how many gallons of white paint must be used?