snappleiscool7oy70h0 snappleiscool7oy70h0 02-12-2017 Mathematics contestada PLEASE HELP ASAP! I NEED TO PASS THIS TEST! Which expressions are perfect square trinomials? Select all that apply. a. x^2+20x+10 b. x^2+7x+49/5 c. 9x^2+12x+4 d. 16x^2+24x+9