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3 years ago

13

BRAINLEIST ANSWER TO WHOEVER GIVES ME CORRECT ANSER FIRST

2 answers:

Anna [14]3 years ago

7 0

First choice is the correct

Keith_Richards [23]3 years ago

3 0

The first choice is the correct one. Seeing that it has consistent increase with the y value per x value

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how many liters of a 40% acid solution must be added to 12 liters of a 20% solution to obtain a 25% solution

kkurt [141]

Answer:

The answer is 4 liters.

Step-by-step explanation:

We want a final 25% solution, which means that the solvent should constitute 25 percent of all the liters of solution.

Let us call $x$ the litres of 40% solution, so when they are added to the 12 litres of 20% solution, the total litres of the new solution are:

$x+12$

of these liters, 25% must be the solvent:

$N=0.25(x+12)$

Now for the 40% solution, the liters of the solvent are $0.4x$ , and for the 20% liter solution, the liters of solve are $0.2*12=2.4$ liters. Thus the total liters $N$ of the solvent are

$N=0.4x+2.4$

Therefore

$N=0.4x+2.4=0.25(x+12)$

$\therefore x=4\:litres$

6 0

3 years ago

A number increased by 10 is two times the number. Write an equation? . Solve the equation and find the number. The number is ?

creativ13 [48]

Write the equation and solve:

x+10=2x

x=2x-10

-x=-10

Solution: x=10

I hope I helped you with your solution! If you could give me brainliest, I would be very thankful!

4 0

3 years ago

Read 2 more answers

3. The quotient of 945 and 15 is_____<br> 4. The decimal notation for 5102/2 is _____

sergij07 [2.7K]

The quotient is 63, and the decimal notation im not sure about

3 0

2 years ago

Read 2 more answers

Please help, I don’t understand

anzhelika [568]

Step-by-step explanation:

i think is p + 7.

i'm not sure

hope it help.

7 0

3 years ago

The population of a certain community is known to increase at a rate proportional to the number of people present at time t. If

attashe74 [19]

Answer:

$t=7.85 years$

Step-by-step explanation:

We can write this rate as an ordinary differential equation.

$\frac{dP}{dt}=aP$

Where a is proportional constant, P the population variable, and t the time.

$\frac{dP}{P}=adt$

Integrating each side of the equation.

$\int \frac{dP}{P}=\int adt$

$ln(P)=at+c$

$P=e^{at+c}$

$P=e^{c}e^{at}=Ce^{at}$

To find C we need to use the initial condiction, it means evaluae P at t=0.

$P_{0}=Ce^{0}=C$

$P=P_{0}e^{at}$

Now, we use the sentence the population has doubled in 5 years.

$2P_{0}=P_{0}e^{a5}$

We can find "a" in this condition.

$2=e^{a5}$

$ln(2)=a5$

$a=\frac{ln(2)}{5}$

$a=0.14$

Finally, let's find how long will it take to triple.

$3P_{0}=P_{0}e^{0.14t}$

$3=e^{0.14t}$

$t=\frac{ln(3)}{0.14}$

$t=7.85 years$

I hope it helps you!

4 0

3 years ago