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masha68 [24]
3 years ago
7

Plplplplplssssssssssssss help me

Mathematics
1 answer:
Svetllana [295]3 years ago
5 0
The answer is choice four 2.50 km/min
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A chemist wishes to mix a solution that is 12% acid. She has on hand 6 liters of a 4% acid solution and wishes to add some 16% a
Damm [24]

Answer:

25 liters of the 16% solution should be added.

Step-by-step explanation:

pure acid amount + pure acid amount = total pure acid amount

0.02*10          + 0.16*x           = 0.12*(10+x)     <<<---=== it is your balance equation;  x is the amount (in liters) of the 16% solution.

0.02*10 + 0.16x = 0.12*10 + 0.12*x

0.16*x - 0.12*x = 0.12*10 - 0.02*10

(0.16 - 0.12)*x = 0.12*10 - 0.02*10

x = %280.12%2A10-0.02%2A10%29%2F%280.16-0.12%29 = 25.

Answer.  25 liters of the 16% solution should be added.

Check.   %280.02%2A10+%2B+0.16%2A25%29%2F%2810+%2B+25%29 = 0.12 = 12% of concentration of the final mixture.   ! Correct !

5 0
4 years ago
Equations and inequalities unit test
Norma-Jean [14]
Equations example 12÷6 you don't write the answer or the equal sign with it
8 0
4 years ago
How many times does 16 go in 41
charle [14.2K]
41/16
=2.5625
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4 0
4 years ago
Is the expression a polynomial? If yes, write in standardform, if not state why not
Studentka2010 [4]

Answer:

Step-by-step explanation:

1) Not a polynomial. Because x² is in the denominator.

2) Yes, it is a polynomial.

Standard form: 5x² + 2x - 99

3) Not a polynomial.

\sqrt{8x^{3}} = (8x^{3})^{\frac{1}{2}} = 8^{\frac{1}{2}}x^{\frac{3}{2}} .

Power of x is a fraction. so , it is not a polynomial.

4) Power of x is (-2). Power of x should not be a negative integer. SO, it is not a polynomial.

5) Yes:

Standard form: -3x⁴ + 12x² + 7x

6 0
2 years ago
Which value for x makes the open sentence true?
Greeley [361]
9. 4- 2(8) = -12
    55-40 = 15 
so C is true
 8. B
  
3 and 6 i dont know . seems : 4 . C & D are both correct 
                                                 6 . All correct

6 0
3 years ago
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