Simplify the given expression.
-5xy(6xy^3-4xy+7y^2)

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

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood?