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insens350 [35]
3 years ago
13

Which number is irrational? O A 3 17 O B. 25 O C. 0.5 O D. 33

Mathematics
1 answer:
stepladder [879]3 years ago
5 0

Step-by-step explanation:

that square of 2 irtional

:))))))))))

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An article suggested that yield strength (ksi) for A36 grade steel is normally distributed with μ = 44 and σ = 5.0. (a) What is
aalyn [17]

Answer:

Step-by-step explanation:

Using normal distribution,

z = (x - μ)/σ

μ= mean = 44 and

σ = standard deviation= 5.0

a) The probability that yield strength is at most 40=

P( x lesser than or equal to 40)

z = (40-44)/5= -0.8

Looking at the normal distribution table,

P( x lesser than or equal to 40) =0.2119

b) P(x greater than 62) = 1 - P(x lesser than or equal to 62)

z = (62-44)/5= 3.6

Looking at the normal distribution table,

P(x greater than 62) = 1 -0.99984

= 0.00016

c)P( 42 lesser than or equal to x lesser than or equal to 62)

= P(x lesser than or equal to 62) - P( x lesser than or equal to 40)

= 0.99987-0.2119= 0.78797

d) What yield strength value separates the strongest 75% from the others.

To get x for strongest 75, we get the z value corresponding to 0.75 from the table

z = 0.675= (x-44)/5

x = 3.375+44 = 47.375

The rest is 25% = 0.25

we get the z value corresponding to 0.25 from the table)

z = -0.67 = (x-44)/5

-3.35= x -44

x = -44+3.35= 40.65

yield strength value that separates the strongest 75% from the others

=47.375-40.65= 6.725

3 0
3 years ago
If a is an integer, when is a/b always equal to an integer <br><br> (I'm terrible at math btw)
lisabon 2012 [21]
I'm really terrible at math too.
8 0
3 years ago
Read 2 more answers
Helppppp..... evaluate 3^-3=
elixir [45]

ANSWER

The answer is

B

\frac{1}{27}

EXPLANATION

The given expression is

{3}^{ - 3}

Use the negative index property;

{a}^{ - m}  =  \frac{1}{ {a}^{m} }

We apply this property to get:

{3}^{ - 3}  =  \frac{1}{ {3}^{3} }

This gives us:

{3}^{ - 3}  =  \frac{1}{3 \times 3 \times 3 }

{3}^{ - 3}  =  \frac{1}{27}

The correct option is B.

6 0
3 years ago
Read 2 more answers
If f(x) = -x2 + 5, what is the value of f(-3)?<br> 0 -14<br> 0-4<br> o 4<br> o 14
muminat

Answer:

<h3>               - 4</h3>

Step-by-step explanation:

f(x)=-x^2+5\\\\f(-3)=-(-3)^2+5=-9+5=-4

6 0
3 years ago
Pls help i dont know ?
Nimfa-mama [501]

Answer:

8 \times(2+15)

Step-by-step explanation:

5 0
1 year ago
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