Someone help me please answer

Which statement about perfect cubes is true

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

For each polynomial, determine the degree and write the polynomial in descending order. a. –4x^2 – 12 + 11x^4 b. 2x^5 + 14 – 3x^4 + 7x + 3x^3