It is given that in the expansion of (3x+y)^n the coefficient of x^3 y^5 is 756k. Find k

Can someone me do math because i am having a breakdown rn because i don’t get it

The constitution gives congress the power to create federal courts lower than the supreme court higher than the supreme court equal to the supreme court, unaffected by the supreme court.

What additional information could be used to prove abc =mqr using sas? check all that apply.