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4 years ago

Solve for d s = n /2 [ 2 a + ( n − 1 ) d ]

Mathematics

1 answer:

ludmilkaskok [199]4 years ago

7 0

The answer is d= -2an+2s/n^2-n

That answer should be in a fraction form.

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A chemist has 200 mL of a 10% sucrose solution. She adds x mL of a 40% sucrose solution. The percent concentration, y, of the fi

user100 [1]

Answer:

The chemist needs to add 400mL of 40% solution.

Step-by-step explanation:

The equation

$y=\frac{0.1(200)+0.4x}{200+x} *100$

gives the percent concentration $y$ of the final mixture, when $x$ mL of the 40% solution are added.

Now we are asked, how many milliliters $x$ of the 40% solution should the chemist add to get final percent concentration $y=30$ ; this is just a matter of solving the equation

$30=\frac{0.1(200)+0.4x}{200+x} *100$

and we solve it the following way:

$30=\frac{0.1(200)+0.4x}{200+x} *100\\\\0.3 =\frac{0.1(200)+0.4x}{200+x}\\\\0.3(200+x)=0.1(200)+0.4x\\\\60+0.3x=20+0.4x\\\\40=0.1x\\\\x=\frac{40}{0.1} \\\\\boxed{x=400\:mL}$

Thus, the chemist needs 400mL of 40% solution to get 30% concentration of the final mixture.

7 0

4 years ago

For my daughter please I give thanks and follwo

Alexeev081 [22]

Answer: A.) 1,308

109×12=1308

I hope this is good enough:

7 0

3 years ago

Read 2 more answers

Point w is reflected across x = 1 (3,-2)

dalvyx [7]

Answer:

are we supposed to find w ?

Step-by-step explanation:

i dk what to do, do you have a pic to go along?

3 0

3 years ago

Lisa earns $8.10 an hour and work 40 hours Jamie earns $10.80 an hour Jamie would have to work how many hours to Eagle leases ea

Rzqust [24]

30 hours. Multiply $8.10 by 40 to get $324. Divide $324 by $10.80 to get 30 hours.

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4 years ago

What’s 12k-6z=36? (please explain)

larisa86 [58]

Answer:

k=3 z=-6

Step-by-step explanation:

12k=36

k=36/12

k=3

-6z=36

z=36/-6

z=-6

12(3)-6(-6)=36

5 0

4 years ago