A street vendor sells two types of newspapers, one for $0.25 and the other for $0.40. If she sold 100 newspapers for $28.00, how many newspapers did she sell at $0.25? PLEASE ANSWER ASAP

What properties allow transformation to be used as a problem solving tool

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)