C=3 is your answer !!!!!!!
Answer:

Step-by-step explanation:
1. Create an equation
<em><u>Concept</u></em> :
If x = 5, then subtracting 5 from both sides gives you x - 5 = 0. Do this to both variables
If x - 5 = 0 and y - 12 = 0, those two statements equal the same thing. So

2. Add 5 to both sides to isolate variable X

3. (Optional) Plug given values into new equation to check answers

5 = 5 is a true statement
Answer:

Step-by-step explanation:
Given
P(a) = 0.60
P(b) = 0.20
P(a and b) = 0.15
Required
Determine P(a or b)
In probability;

Substitute values for P(a and b), P(a) and P(b)

Collect Like Terms


<em>Hence, option B answers the question</em>