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3 years ago

I Need Helpp PLZZ i will mark as brainliest

Mathematics

2 answers:

kati45 [8]3 years ago

6 0

Answer:

Reasoning:

You multiply x by 9 and 2 by 9 and it expands out from 9(x+2) to 9x+18

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I hope this helps and good luck!

dmitriy555 [2]3 years ago

4 0

Answer:

9x + 18

Step-by-step explanation:

9 times x = 9x

9 x 2 = 18

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How do you calculate the are of a circle with a radius of 12 ft<br> PLEASE HELP !

Fed [463]

Answer:

12ft / 6

Step-by-step explanation:

8 0

3 years ago

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the length of a rectangle is 13 centimeters less than its width. What are the dimensions of the rectangle if it’s area is 114 sq

Novosadov [1.4K]

Answer:

w = 19

L = 6

Step-by-step explanation:

L = w - 13

a = lw

114 = w(w - 13)

114 = w² - 13w

w² - 13w - 114

(w - 9) (w + 6)

w ≠ -6 (a length cannot be negative)

w = 19

L = 19 - 13

L = 6

7 0

3 years ago

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If every gram of salt is 20.9% chlorine, how much is required to make a 220 ppm chlorine solution with 350 grams of water?

Temka [501]

Answer:

The amount of salt required is 0.3685 grams.

Step-by-step explanation:

20.9% of 1 gram of salt is chlorine, which means the grams of chlorine in 1 gram of salt are

$\dfrac{20.9\%}{100\%} *1\: gram = 0.209g\: \text{chlorine}$

Now, to make 220 ppm solution, it must be that

$\dfrac{220}{10^6} = \dfrac{y}{350+y},$

where $y$ is the grams of chlorine required.

We rearrange the equation and solve for $y:$

$220(350+y) = 10^6y$

$77000+220y =10^6y$

$77000 = (10^6-220)y$

$y = \dfrac{77000}{999780}$

$\boxed{y= 0.07702g}$

since 1 gram of salt has 0.209 grams of chlorine, 0.07702g of chlorine corresponds to

$\dfrac{0.07701}{0.209} = 0.3685g {\text{ of salt. }$

Thus the amount of salt required is 0.3685 grams.

7 0

3 years ago

This is the third time I'm asking. I feel like Brainly won't help anyone above middle school but whatever. It's Geometry. Pls an

Pie

I believe it is a for this question

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4 years ago

Joe's summer camp had 81 attendees when it first opened and has grown by 92 attendees per year since then.

pychu [463]

Answer:

A = 92y + 81

Step-by-step explanation:

Because A = number of attendees and if it adds 92 each year, you times the number of years by 92 and add 81 for the ones that were already there

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3 years ago