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3 years ago

Please help with algebra

Mathematics

2 answers:

notka56 [123]3 years ago

7 0

Answer:

Step-by-step explanation:

100

Irina-Kira [14]3 years ago

5 0

Answer:

Step-by-step explanation:

when you multiply numbers with exponents then you add the exponents and multiply the first digit

if you want an example or prove it replace the variables with a number 2 for a and 3 for b

(10(2)^5*(3)^3) * (5(2)^6*(3)^2)= 24883200

and c is equal to 24883200

you can try the same process for the rest to double check

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3 years ago

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:

$P(X$