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3 years ago

7

The chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to t

he 10% solution to get this concentration?

2 answers:

3241004551 [841]3 years ago

4 0

The answer is 400 mL

kow [346]3 years ago

4 0

Answer:

400 mL

The next answers are: 600 mL, and then 180 g

Step-by-step explanation:

these are the correct answers on ed-genuity, hope this helps! :)

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3 years ago

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Solve 7x + 2 < 9x - 4

Alexus [3.1K]

Answer:

$\boxed{\bold{x>3}}$

Step By Step Explanation:

Subtract 2 From Both Sides

$\bold{7x+2-2$

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$\bold{7x-9x$

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$\bold{\left(-2x\right)\left(-1\right)>\left(-6\right)\left(-1\right)}$

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- Mordancy

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3 years ago

Which does not show a direct variation between x and y?

Dmitry [639]

$(1)\\direct\ variation\ between\ x\ and\ y:\ \ \ y=k\cdot x\ \ \ and\ \ \ k\in\ R\\\\Ans.\ NOT\ direct\ is\ D\\\\(2)\\f(x) = m\cdot x\ \ \ and\ \ \ f(6)=8\\\\ \Rightarrow\ \ \ m\cdot 6=8\ \ \ \Rightarrow\ \ \ m= \frac{8}{6} = \frac{4}{3} \ \ \ \ \Rightarrow\ \ \ \ Ans.\ D\\\\(3)\\f(x)=30x\ \ \ \Leftrightarrow\ \ \ \frac{f(x)}{x} =30\ \ \ \ \ \ \Rightarrow\ \ \ \ constans=30\ \ \ \ Ans.\ B.$

$\\\\(4)\\f(x)=m\cdot x\ \ and\ \ f(8)=56\\\\m\cdot8=56\ \ \Leftrightarrow\ \ m= \frac{56}{8} =7\ \ \Rightarrow\ \ \ f(x)=7x\ \ \ \Rightarrow\ \ \ f(2)=7\cdot2=14\\\\Ans.\ D.$

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3 years ago

Which type of measurement is used more often by scientists?

Roman55 [17]

The answer to your question should be "<span>Both weight and mass are used equally by scientists"</span>

6 0

3 years ago

Zane bought a pair of jeans that originally cost $56. He used a coupon for 25% off and paid 8% in sales tax. How much did he pay

sattari [20]

Answer:

$38.64

Step-by-step explanation:

so the equation needed to solve is $56*0.25 and that number is 14. Since it is a coupon you subtract 14 from 56 and end up with 42. Now multiply 0.08*42 and you got your sales tax, $3.36. now subtract that from 42 and you have your answer! Don't forget the dollar sign!

hope this helped! : )

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3 years ago