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Ludmilka [50]
3 years ago
8

Jamal works as an electrician’s apprentice. He rewired 4 electrical outlets in 1 1/2 hours. If he works at the same pace for 7.5

hours, how many outlets will he rewire?
5 outlets
13 outlets
20 outlets
30 outlets
Mathematics
2 answers:
RSB [31]3 years ago
6 0

This can be solve by first solving the proportionality constant

Number electic outlets rewired is directly proportional to time spent

4 = (1 ½)a

Let be the proportionality constant

A = 8/3

O = (8/3)(7.5)

o = 20 outlets will jamal rewired if he works for 7.5 hrs 

g100num [7]3 years ago
4 0

Answer:

o = 20 outlets will jamal rewired if he works for 7.5 hrs

Step-by-step explanation:

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Simplify this <br> 6x-3y-z+2x+3y-7z
erica [24]

Answer:

8x - 8z.

Step-by-step explanation:

Let's first rearrange 6x-3y-z+2x+3y-7z where all the x's are together, all y's together, and all z's are together:

6x +2x + 3y - 3y - z - 7z.

First we combine like terms.

6x + 2x ⇒ 8x

3y - 3y ⇒ 0

z - 7z   ⇒ -8z.

Since the y's result in 0, we do not include them.

Therefore, our answer is 8x - 8z.

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3 years ago
Prove:<br> a/(b+c)+b/(a+c)+c/(a+b)&lt;2
faust18 [17]

Answer:

Step-by-step explanation:

a/(b+c) < 2a/(a+b+c)

b/(a+c) < 2b/(a+b+c)

c/(a+b) <2c/ (a+b+c)

so a/(b+c)+b/(a+c)+c/(a+b) <2(a+b+c)/(a+b+c)=2

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2 years ago
A person invests $2,740 in an account that earns 4.3% annual interest. Find when the value of the investment reaches $7,000. If
Juli2301 [7.4K]

So, to set up your equation is the hardest part. If you remember the basic format, you're set.

I(t) = P * (1+r%)^t

t= time and this will be our variable

Initial amount P = $2740

Rate = 4.3% which converts numerically into .043

I(t) = 7000

Before we get to find out how to find how many years it takes to get to $7000, set up the basic equation by plugging in what we know.


I(t) = $2740(1+4.3%)^t

I(t)=2740(1.043)^t

Now plug in for $7000 for I(t)

7000=2740(1.043)^t                 Divide both sides by 2740

7000/2740 = 2740/2740(1.043)^t

2.55474453=(1.043)^t

Now you can solve for t in two ways. You can either use the natural log or graph it on your graphing calculate and see when the two equations meet.

In your calculator you can set up:

ln(2.55474453)/ln(1.043) = t                 which is the method I prefer since it's much simpler

t=22.278528

but you can also graph it in your ti-84

with

y1=2.55474453

y2=(1.043)^x

and find where they intersect on the graph.

either way it'll be the same answer

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2 years ago
Out of 1,000 students, 80 were asked by random sampling what color they would prefer for their first car. Their responses are sh
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Answer: First off, what answer are you looking for? it's hard for me to answer something without specification.

Step-by-step explanation:

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2 years ago
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Is finding a car's depreciation over a 10 year period considered as univariate or bivariate?
g100num [7]

Determining a car's depreciation over a ten year period is considered a bivariate.

<h3>What is a bivariate?</h3>

A Bivariate data is made up of two variables that are observed against each other. In determining the deprecation of a car, the cost of the car is observed against the passage of time and the depreciation factor.  

To learn more about depreciation, please check: brainly.com/question/25552427

#SPJ1

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