# Math 221 Excercises Essay

283 WordsFeb 21, 20122 Pages
01 . 24-(19-11) +{(-2)2/2}(-5)+32 = 24-8+(4/2)(-5)+9 24-8+(2)(-5)+9 24-8+-10+9 15 02. (3/5)+(1/8) / (3/4) – (1/7)*(2/3) = (3/5) + (1/8) * (4/3) – (1/7)*(2/3) (3/5) + (1/6) – (2/21) (18/30) + (5/6) – (2/21) (23/30) – (2/21) (483/630) – (60/630) 423/630 47/70 03. 20 80 120 MCD = 20 20/20 = 1 80/20 = 4 120/20=6 04. a=2 b= -3 (3a-2)/8 – 6b/a (32-2)/8 – 6(-3)/2 (9-2)/8 + (18/2) (7/8) + (18/2) (7/8) + (72/8) 79/8 9 7/8 05. 2x+4&gt;5x-12 2x-2x+4 &gt; 5x – 2x – 12 4&gt;3x-12 12+4&gt;3x-12+12 16&gt;3x 1/3(16)&gt;3x(1/3) 16/3&gt;x 5 1/3 &gt; x 06.15/25 = 3/x 15/25 = 3/x (15/25) / 5/5 = 3x 3/5 =3/x (x/1)(3/5)= (3/x)(x/1) (3/5)x = 3 (5/3)(3/5)x = 3(5/3) x=5 07.(6x2+1)(2x-2) (6x2+1) (x-1)2 (6x3- 6x2 + x – 1)2 08.4x2+8x+3 (2x+3)(2x+1) 09. 4(5x-2y) = 3tx – 5e 20x - 8y = 3tx -5e -8y – 20x + 20x = 3tx – 5e + 20x -8y = 3tx – 5e + 20x -8y + 5e = 3tx + 20x – 5e + 5e -8y + 5e = 3tx + 20x (1/3t)(-8y + 5e) = 20x + (3tx)(1/3t) (-8y+5e)/3t = 20x + x (-8y+5e)/3t = 21x (1/21)((-8y+5e)/3t) = 21x (1/21) (-8y+5e)/63t =