After simplification, the value of 1-2/1(1+2)-3/(1+2)(1+2+3)-4/(1+2+3) (1+2+3+4)-...-100/(1+2+...+99)(1+2+ ...+100) is a proper fraction in its lowest form. Find the difference of its numerator and denominator.

Fa bus driver leaves her first stop by 7: 00 a. m., her route will take less than 37 minutes. if she leaves after 7: 00 a. m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.

What is always true about a positive integer raised to a negative odd power?