The following marks were earned in the recent dass test out of 60 . a. Arrange the scores in ascending order and then place them correctly on the stem and leaf display below. \( 34 \quad 31 \quad 29 \quad 17 \quad 25 \quad 53-34 \quad 41 \quad 19 \quad 40 \quad 49 \quad 28 \quad 27 \quad 33 \quad 35 \quad 55 \quad 47 \quad 56 \quad 59 \quad 34 \) \( 60 \quad 23 \quad 32 \quad 2838 \) 17

\( \begin{array}{llllll}\text { (1) } & (+3) \times(+4) & (2) & (+3) \times(-4) & (3) & (-3) \times(+4) \\ (4) & (-3) \times(-4) & (5) & (+5)(6) & (6) & (+5)(-6) \\ (7) & (-5)(-6) & (8) & (-5)(6) & (9) & -9 \times-4 \\ (10) & -11 \times 8 & (11) & 17 \times-2 & (12) & 19 \times 2 \\ (13) & (-13)(-13) & (14) & -142 \times 34 & (15) & (187) \times(-78)\end{array} \)

2. Un móvil pasa por A con una velocidad de \( 45 \mathrm{~km} / \mathrm{h} \) y por B a razón de \( 60 \mathrm{~km} / \mathrm{h} \). ¿Cuál es su aceleración si tardo en cubrir la distancia \( A B 2 \) minutos?

Tarea: 1) \( 3 x^{3} y-5 x y^{3}+3 x^{4}-x^{4} \) entre \( x^{2} 2 x y+y^{2} \)

3 Factorise completely: \( 2.3 .1 \quad x^{2}+5 x-24 \)

Simplify the following radical. \[ -\sqrt{-121} \]