Simplify: 15w6 + (-5w6)

plz help !!!

There is diarrhea on the floor. what do i do? my mum gonna see that i diarrhea on the floor! * don't report, i'm serious! *

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

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab