Find the difference between the sum of all even numbers and the sum of all odd numbers from 0 through 1000

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

What is always true when two whole numbers are subtracted?