Find all values of b or c that will make the polynomial a perfect square trinomial. 100r²-60r+c

Find all values of b or c that will make the polynomial a perfect square trinomial. 49x²+70x+c

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

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

Write each rational expression in lowest terms. 8k + 16 / 9k + 18

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