Doboman

4 4/35 = 144/35

2 1/10 = 21/10

144/35 x 2 = 288/70

21/10 x 7 = 147/70

288 x 70 = 20160

 70  x 147 = 10290

20160/10290 = 96/49 or 1 47/49 or 1.959

(x-10)(x+3)

2 inches

happy birthday!!!!!

                     /\

                   /*  \

                  /   * \

                 | *    *|

                  ---*---

                 |  oo  |

                 |,___,|

2x + 0.8 = 0

2x = -0.8

x = -0.4

8.69 / 25.05 = 0.3469(4 s.f.)

Ans * 10^-3 = 0.3469 * 0.001     »»»     0.0003469 (approx)

multiply everything by 4;

x > 4x-48

put all x's onto the left hand side;

-3x > -48

multiply everything by -1;

3x < 48

(when you multiply by a negative in an inequality, > turns into < and vice versa)

divide everything by 3;

x < 16

4 

area of trapezoid = height * (a + b) / 2

Height = sqrt(13² - 5²) = sqrt(144)     »»»     sqrt(144) = 12

a = 15

b = DK = 5 + 15 + sqrt(20² - height²)     »»»    20 + sqrt(20² - 12²) = 20 + sqrt(256) = 36

area = 12 * (15 + 36) / 2     »»»     6 * 51 = 306 units²