Factor completely: $x^3+x^2-4x-4.$

Write each rational expression in lowest terms. 8x² + 16 / 4x²

Write each rational expression in lowest terms. 3(3 - t) / (t + 5)(t - 3)

Write each rational expression in lowest terms. m² - 4m + 4 / m² + m - 6

Write each rational expression in lowest terms. 8m² + 6m - 9 / 16m² - 9

Write each rational expression in lowest terms. x³ + 64 / x + 4

Multiply or divide, as indicated. (2k + 8)/6 ÷ (3k + 12)/2