Which equaton represents a line that has a slope of -1/2 and passes through point (4, -5)
1 answer:
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we know that
the equation
describe a vertical parabola with vertex at point
if -------> the parabola open Up and the vertex is a minimum
if -------> the parabola open Down and the vertex is a maximum
in this problem we have
---> because is positive (given problem)
so
The vertex is a minimum
therefore
<u>the answer is the option C</u>
Up
Answer:
The probability that you test exactly 4 batteries is 0.0243.
Step-by-step explanation:
We are given that a new battery's voltage may be acceptable (A) or unacceptable (U). A certain flashlight requires two batteries, so batteries will be independently selected and tested until two acceptable ones have been found.
Suppose that 90% of all batteries have acceptable voltages.
Let the probability that batteries have acceptable voltages = P(A) = 0.90
So, the probability that batteries have unacceptable voltages = P(U) = 1 - P(A) = 1 - 0.90 = 0.10
Now, the probability that you test exactly 4 batteries is given by the three cases. Firstly, note that batteries will be tested until two acceptable ones have been found.
So, the cases are = P(AUUA) + P(UAUA) + P(UUAA)
This means that we have tested 4 batteries until we get two acceptable batteries.
So, required probability = (0.90 0.10
0.10
0.90) + (0.10
0.90
0.10
0.90) + (0.10
0.10
0.90
0.90)
= 0.0081 + 0.0081 + 0.0081 = <u>0.0243</u>
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Hence, the probability that you test exactly 4 batteries is 0.0243.
it’s hard to explain so look at the picture i attached to this :)
