Pls answer assap!
57-6²÷ [2+1]*4

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

Solve the triangle. a = 21°, c = 105°, c = 5

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y