Answer:

Step-by-step explanation:
well the values for x are from -2 to ∞
so we can write it as

Answer:
0.4 , 0.1
Step-by-step explanation:
Let number of boys be = b , number of girls = b + 4 . As total students = 20 b + b + 4 = 20 → 2b + 4 = 20 → 2b = 20 - 4 = 16 → b = 16 / 2 = 8 (boys) , so girls = 12
Prob (a random first child is a boy) = boys / total students = 8 c 1 / 20 c1, or = 8 / 20 = 0.4
Prob ( a 'Tina' out of two Tina is the last) = 2 c 1 / 20 c 1 , or = 2 / 20 = 0.1
Answer: number of blue pen = 128
Number of pen in the box = 320
Step-by-step explanation:
<span>Solución
X = {0, 121}
</span><span>espero que esto ayude</span>