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3 years ago

What is the factored form of x2 – x – 2?

Mathematics

2 answers:

Sav [38]3 years ago

7 0

x^2 - x - 2

( x - 2 ) ( x +1) is the answer

s2008m [1.1K]3 years ago

6 0

A.) (x - 2)*(x + 1)

I'm going to assume that x2 means x squared(x^2)

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The Browns are moving across the country. Mr. Brown leaves 3.5 hours before Mrs. Brown. If he averages 45 mph and she averages 9

Alex Ar [27]

I believe it would be 3.5 hours

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3 years ago

What is a division problem that has the answer 6?? 8th grade

nika2105 [10]

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2 years ago

What is 2s-4=6 solve please

hjlf

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3 years ago

Read 2 more answers

Solve the system of equations.

Helga [31]

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2 years ago

The probability density function of the time you arrive at a terminal (in minutes after 8:00 A.M.) is f(x) = 0.1 exp(−0.1x) for

Blababa [14]

$f_X(x)=\begin{cases}0.1e^{-0.1x}&\text{for }x>0\\0&\text{otherwise}\end{cases}$

a. 9:00 AM is the 60 minute mark:

$f_X(60)=0.1e^{-0.1\cdot60}\approx0.000248$

b. 8:15 and 8:30 AM are the 15 and 30 minute marks, respectively. The probability of arriving at some point between them is

$\displaystyle\int_{15}^{30}f_X(x)\,\mathrm dx\approx0.173$

c. The probability of arriving on any given day before 8:40 AM (the 40 minute mark) is

$\displaystyle\int_0^{40}f_X(x)\,\mathrm dx\approx0.982$

The probability of doing so for at least 2 of 5 days is

$\displaystyle\sum_{n=2}^5\binom5n(0.982)^n(1-0.982)^{5-n}\approx1$

i.e. you're virtually guaranteed to arrive within the first 40 minutes at least twice.

d. Integrate the PDF to obtain the CDF:

$F_X(x)=\displaystyle\int_{-\infty}^xf_X(t)\,\mathrm dt=\begin{cases}0&\text{for }x$

Then the desired probability is

$F_X(30)-F_X(15)\approx0.950-0.777=0.173$

7 0

3 years ago