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MaRussiya [10]
3 years ago
8

4(r + 20) = 1/5(20r + 400)

Mathematics
2 answers:
antoniya [11.8K]3 years ago
7 0

Answer:

no solution

Step-by-step explanation:

4(r + 20) = 1/5(20r + 400)

4r + 80= 4r+ 80

-4r           -4r

80= 80

Hope this helps

Anestetic [448]3 years ago
4 0

Answer:

r = r

Step-by-step explanation:

4(r + 20) = 1/5(20r + 400)

4r + 80 = 4r + 80

    - 80         - 80

<u>4r</u> = <u>4r</u>

4      4

r = r

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soymeal is 14 percent protein cornmeal is 7 percent protein how many pounds of each should be mixed together in order to get 280
erma4kov [3.2K]
Let the weight of soymeal be s, and let the weight of cornmeal be c.
You need a total of 280 lb, so that gives us one equation.

s + c = 280

Now we use the protein to write another equation.
The protein in s lb of soymeal is 0.14s.
The protein in c lb of cornmeal is 0.07c.
The protein in 280 lb of 0.09% protein mix is 0.09(280).
This gives us a second equation.

0.14s + 0.07c = 0.09(280)

Now we solve the two equations as a system of equations.

s + c = 280
0.14s + 0.07c = 0.09(280)

Solve the first equation for s and plug in tot eh second equation.

s = 280 - c

0.14(280 - c) + 0.07c = 25.2

39.2 - 0.14c + 0.07c = 25.2

-0.07c = -14

c = 200

Now we substitute c = 200 in the first equation to find s.

s + 200 = 280

s = 80

Answer: 200 lb of soymeal and 80 lb of cornmeal
6 0
3 years ago
Evaluate the expression<br> 15<br> X - 6, when x= 4.<br> es
Daniel [21]

Answer:

54

Step-by-step explanation:

I'm assuming the equation looks like this: 15x - 6

15*4 - 6

60 - 6

54

OR if it's just x-6 then the answer is -2

Hope this is what you were asking, have a nice day! :)

7 0
3 years ago
Which statements are true about the place values in the number 99.999?
allsm [11]
Answers A. and B. Are correct
5 0
3 years ago
Which point is a solution to the inequality
Nata [24]

Answer:

y < -x - 5

-4 < -(-3) - 5 = 3 - 5 = -2

So its point (-3, -4)

8 0
3 years ago
Find X and Y. <br> I really need help on this. It’s confusing.
stepan [7]

Step-by-step explanation:

7x-2 ) + (١١x -34)

so u will get the answer

after getting it u can easy get y

4 0
3 years ago
Read 2 more answers
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