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weeeeeb [17]
2 years ago
5

Evaluate 3x2-1 when x=2

Mathematics
2 answers:
Nezavi [6.7K]2 years ago
7 0
I would guess 61 in my school we only do things like this x4 - 5 x times four minus five so I don’t know if that’s right but that would be my guess if that isn’t right it would be 62 times 2
AfilCa [17]2 years ago
5 0

Answer:

11

Step-by-step explanation:

3 times 2 times 2 - 1

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The defect length of a corrosion defect in a pressurized steel pipe is normally distributed with mean value 30 mm and standard d
skelet666 [1.2K]

Answer:

z=-0.842

And if we solve for a we got

a=30 -0.842*7.8=23.432

So the value of height that separates the bottom 20% of data from the top 80% is 23.432.  

Step-by-step explanation:

Let X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

X \sim N(30,7.8)  

Where \mu=30 and \sigma=7.8

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.80   (a)

P(X   (b)

As we can see on the figure attached the z value that satisfy the condition with 0.20 of the area on the left and 0.80 of the area on the right it's z=-0.842

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=-0.842

And if we solve for a we got

a=30 -0.842*7.8=23.432

So the value of height that separates the bottom 20% of data from the top 80% is 23.432.  

8 0
3 years ago
Use function notation to write a recursive formula to represent the sequence: 3, 6, 9, …
dlinn [17]

Answer:

f(n) = f(n - 1) + 3

Step-by-step explanation:

Substitute $ n = 1, 2, 3,.. $ to get the recursive formula.

OPTION 1: f(n) = f(n - 1) + 3

Substituting n = 1.

f(1) = f(1 - 1) + 3 = 0 + 3 = 3.

Substituting n = 2.

f(2) = f(2 - 1) + 3 = f(1) + 3 = 3 + 3 = 6.

Substituting n = 3.

f(3) = f(3 - 1) + 3 = f(2) + 3 = 6 + 3 = 9.

The numbers match the given sequence. So, we say the above recursive formula represents the sequence.

OPTION 2: f(n) = f(n - 1) + 2

Substituting n = 1

f(1) = f(0) +  2 $ \ne $ 3.

So, this is eliminated.

Similarly, OPTION 3 and OPTION 4 can be eliminated as well.

4 0
3 years ago
If y varies directly as the x^2 and y =200 when x =5 ,What is the value of y when x =-3
PtichkaEL [24]

The answer you want would be -120

b/c 200/5 is 40 so -3*40 is <em>-120</em>

6 0
3 years ago
Read 2 more answers
MOREEEEEEEEEEEEEEEEEEE POINTSSSSSSSSSSSSSSSSSSSSSS
WINSTONCH [101]

Answer:

Thank you so much

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Which parametric equations represent y = – |x|? Check all that apply.
Alenkasestr [34]

Answer:

The right options are C and E.

Step-by-step explanation:

I got it right on Edge.

7 0
3 years ago
Read 2 more answers
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