We will be using the fact that
, where
is the probability that the first bulb works and
is the probability that the second bulb works.
The probability that the first bulb works is
. However, when we take one out (given that the first bulb works) we now have 19 working bulbs and 4 bad ones. This means that the probability that the second bulb works is
.
Now, we can find our final probability:

Answer:
2.25a-5
Step-by-step explanation:
rate brainiest please!
Copper: density ≤ 3.4
Iron: density=2.26
Before: 200 t
After: 800 t
Answer:
A) -56
Step-by-step explanation:
B) First, you have to ignore the plus sign, and recognize that the second negative number means you are subtracting that number.
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Answer:
your slope is 6/13
Step-by-step explanation:
slope = rise/run = y2-y1/x2-x1