How do you write 31% as a fraction in simplest from

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

Solve the equation using the zero-product property. -3n(7n - 5) = 0 a. 0, -5/7 b. -1/3, -5/7 c. -1/3, 5/7 d. 0, 5/7

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i