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MatroZZZ [7]
3 years ago
7

What is blank divided by 4 equals 9

Mathematics
2 answers:
poizon [28]3 years ago
6 0

For this case, the first thing we are going to do is define a variable.

We have then:

x: unknown number

We now write the expression that models the problem:

\frac{x}{4}= 9

From here, we clear the value of x.

We have then:

x = 9 * 4\\x = 36

Answer:

36 divided by 4 equals 9

sveta [45]3 years ago
5 0
x : 4 = 9  \ \ \ \ /*4 \\ x=36
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marin [14]
So you are rounding 60.89.
I don't know which way you are aiming for to round, but here are some possible answers.
61.00
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It is fall and time for joseph to harvest his farm. He currently has 120 acres of wheat. With the help of his farm equipment he
salantis [7]
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2 years ago
Pete borrowed $400 for 1 year. He paid back a total of $440. What was the interest rate per year?
OleMash [197]

I=PRT/100

1. Make R (rate) subject

R/100= I/PT

2. Substitute and calculate

r/100= i/pt

r/100= 40/400 × 1

(<em>4</em><em>0</em><em> </em><em>i</em><em>s</em><em> </em>from 440-400.<em>T</em><em>h</em><em>e</em><em> </em><em>i</em><em>n</em><em>t</em><em>e</em><em>r</em><em>e</em><em>s</em><em>t</em>)

r/100= 0.1

r/100×100= 0.1×100

r=10% (interest rate per year)

To confirm

I=PRT

I= 400×10/100×1

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5 0
3 years ago
Read 2 more answers
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
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.5 x .06=.03
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