Answer:
6
Step-by-step explanation:
4(6) - 7y = -18
24 - 7y = -18
-7y= -42
y= 6
Answer:

Step-by-step explanation:
Given



Required
The probability of selecting 2 same colors when the first is not replaced
The total number of ball is:


This is calculated as:

So, we have:

<em>Note that: 1 is subtracted because it is a probability without replacement</em>






It is incorrect because when you times a negative by a positive. It is a negative number.
Answer:

Step-by-step explanation:


15x+10x=12x+90; ⇔ 13x=90;

Answer:
1/15
Step-by-step explanation:
2/5-1/3=6/15-5/15=1/15