The position of particles A and B is described by IA = [2 ti +(t2-1) i and<br />r = [(t + 2)i + (2 t- 5) i), respectively , where t is in seconds. Determine the point<br />where the particles collide and their speeds just before the collision.<br /><br /><br />fast need help.​

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

imma say 16%. sorry if its wrong. i'm doing the same stuff right now

step-by-step explanation:

the answer is:

mean: 6

mad: 2.14