Write the name of the period that has the digits 913

Given f(x) = 2x^2- 5x+1, determine the function value f(2). do not f(x) = in your answer

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?