4. if n is the set of natural numbers that are factors of 20, choose the selection below that correctly shows this set in roster form. {2, 4, 5, 10} {2, 4, 6, 8, 10, 12, 14, 16, 18, 20} {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20} {1, 2, 4, 5, 10, 20} 5. suppose u = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} is the universal set, and p = {1, 4, 9}. what is ? {2, 3, 5, 6, 7, 8} {2, 4, 6, 8} {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} {2, 3, 5, 6, 7, 8, 10}

More challenges: 1) factor out the indicated quantity.8mn² + 7mn - m : factor out the quantity -m2) factor the polynomial by grouping.2vw + 7cv + 14cw + 49c²3) factor completely using the difference of squares along with factoring by grouping.25v³ - 25v² - 4v + 44) factor the sum of cubes. 125x³ + 645) q³ + 27r³6) factor completely. use difference of squares.729p^6 - 6^67) solve the equation(7x + 4)(9x - 1) = 08) a. find the values of x for which f (x) = 0b. find f (0)f (x) = x² + 2x - 489) find the x and y-intercepts for the function defined by y = f (x)f (x) = (x + 3)(x + 4)(x - 1)²10) factor the trinomial completely by using any method. remember to look for a common factor first. 3v² - 2v - 16