Một sản phẩm được lấy ngẫu nhiên có thể là sản phẩm loại 1 (ký hiệu là A) hoặc sản phẩm loại 2 (ký hiệu là B) hoặc sản phẩm
loại 3 (ký hiệu là C). Hãy mô tả bằng lời các biến cố sau
a) A + B b) AB + C c) A + C d) AC

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)