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3 years ago

Simplify completely 12x^3-4x^2+8x over -2x

Mathematics

1 answer:

sergejj [24]3 years ago

4 0

Hello :
<span> (12x^3-4x^2+8x) / -2x = - 6x²+2x - 4</span>

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Simplify the expression and write your answer in<br> scientific notation: (1.4 X 103)3

Soloha48 [4]

Step-by-step explanation:

(1.4 X 10³)³

2.744×10⁹

Hope it helps u

5 0

3 years ago

For a normal distribution with μ=500 and σ=100, what is the minimum score necessary to be in the top 60% of the distribution?

STatiana [176]

Answer:

475.

Step-by-step explanation:

We have been given that for a normal distribution with μ=500 and σ=100. We are asked to find the minimum score that is necessary to be in the top 60% of the distribution.

We will use z-score formula and normal distribution table to solve our given problem.

$z=\frac{x-\mu}{\sigma}$

Top 60% means greater than 40%.

Let us find z-score corresponding to normal score to 40% or 0.40.

Using normal distribution table, we got a z-score of $-0.25$ .

Upon substituting our given values in z-score formula, we will get:

$-0.25=\frac{x-500}{100}$

$-0.25*100=\frac{x-500}{100}*100$

$-25=x-500$

$-25+500=x-500+500$

$x=475$

Therefore, the minimum score necessary to be in the top 60% of the distribution is 475.

3 0

2 years ago

At the local pet store, zebra fish cost $2.00 each and neon tetras cost $2.15 each. If Ernesto bought 15 fish for a total cost o

bezimeni [28]

So first create and define your variables:
Z = amount of zebra fish
N = amount of neon tetras

Now create your equations:
2z+2.15n=31.20
z+n=15
This is your system. There are multiple methods to use but in this problem I’ll use the substitution method by simplifying the bottom equation.
2z+2.15n=31.20
z=15-n
Now I’ll plug the bottom equation into the top one.
2(15-n)+2.15n=31.20
And just solve from here.
30-2n+2.15n=31.20
0.15n=1.20
n=8
So he bout 8 neon tetras, and 15-8= 7, so he bought 7 zebra fish

6 0

3 years ago

Read 2 more answers

What is the CORRECT answer to this question???

MrMuchimi

Hello!
The most logical equation would be b)
Hope it helps, have a nice day!

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3 years ago

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How many lines of symmetry does the letter z have ?

JulijaS [17]

Answer: