Answer:

Step-by-step explanation:
We have that:

In which P(a) is the probability of a but not b and
is the probability of both A and B.
By the same logic, we have that:

Also
P(A or B) is

Events A and B are mutually exclusive
This means that 





Divide both sides by 3
x + 2 = 7
x = 5
Answer:
Grade 8 Worktext-Science Quarter 3
Answer:
$504
Step-by-step explanation:
Step one:
given data
A shirt that cost $420
we are told that the shirt was on a discount sale of 20%, so when the discount is over the price will return to $420, we are then told that the shirt was marked up 20%.
Step two:
Hence the new cost is
=20/100*420+ 420
=0.2*420+420
=84+420
=$504