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3 years ago

Please help! Q and R are mutually exclusive events. If P(Q)=0.1 and P(R)=0.45, find P(Q or R).

Mathematics

2 answers:

Natasha2012 [34]3 years ago

7 0

0.45 x 0.1 = 0.045 is the correct answer. Hope I helped.

Scilla [17]3 years ago

4 0

I want to say that it is A) 0.550

I'm pretty sure that you only multiply when it says and, as in P(Q and R).
P(Q or R) means that you add the two probabilities.

0.1 + 0.45 = 0.550

Correct me if I am wrong though. I was never very good with probability.

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Please show me how to solve for Xsquared - 21.75X = -15.75. I have the solution but do not know how to solve it.

Andreas93 [3]

$x^2-21.75x=-15.75 \\
x^2-21.75x+15.75=0$

Use the quadratic formula:
$x^2-21.75x+15.75=0 \\ \\
a=1 \\ b=-21.75 \\ c=15.75 \\ b^2-4ac=(-21.75)^2-4 \times 1 \times 15.75=473.0625-63=410.0625 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-(-21.75) \pm \sqrt{410.0625}}{2 \times 1}=\frac{21.75 \pm 20.25}{2} \\
x=\frac{21.75-20.25}{2} \ \lor \ x=\frac{21.75+20.25}{2} \\
x=\frac{1.5}{2} \ \lor \ x=\frac{42}{2} \\
x=\frac{15}{20} \ \lor \ x=21 \\
x=\frac{3}{4} \ \lor \ x=21 \\
\boxed{x=\frac{3}{4} \hbox{ or } x=21}$

3 0

3 years ago

Jamal watched his older brother Robert lift weights. The bar alone had a mass of 20 kg. on the bar he had two 11.4 weights, two

Leto [7]

What you have to do is add them all!
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11.4 2 11.4 weights
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1,811.8 is the answer

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3 years ago

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-BARSIC- [3]

Answer:

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Step-by-step explanation:

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3 years ago

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faltersainse [42]

Answer:

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Step-by-step explanation:

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3 years ago

The following table shows the number of feet a bird flies above the ground as a function of time: (In the picture)

Otrada [13]

Answer:

D.) (14, 0); the time it takes for the bird to reach the ground

Step-by-step explanation:

The attached graph shows a plot of the table values and the two offered solution options.

The dependent variable in this scenario is the bird's height above the ground. When that is zero, the bird is on the ground. This fact makes choices B and C seem ridiculous.

We note from the table and graph that the bird is on a path that decreases in height by 3 feet every 2 seconds. If the bird continues that rate of descent, it will reach the ground after 14 seconds.

That is, its (time, height) pair will be (14, 0), matching choice D.

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Choosing any answer to this question requires making assumptions that are inconsistent with real-world bird behavior. At least, the problem statement should say what assumptions are applicable.

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3 years ago

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