Ms. smith is spitting a class of 21 students into 3 groups. what is 1/3 of 21

Geometry answer picture question pls . reason and statements

What are the sotions to the quadratic equation 9x^2=4

What is the ratio of the change in y-values to the change in x-values for this function? a) 1: 13 b) 2: 5 c) 5: 2 d) 13: 1