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2 years ago

George wishes to increase the percent of acid in 50 ml of a 15% acid solution in water

Mathematics

2 answers:

PtichkaEL [24]2 years ago

3 0

Answer:

screw this question

Step-by-step explanation:

To change from 15% to 25% he needs to add 10%.

If the solution is 50ml then he needs to add 10% which is 5ml... But if he adds 5 ml then the solution will be 55ml total, so that doesn't make sense. He has to take some of the solution that's not acid before adding the 5ml...

sammy [17]2 years ago

3 0

Answer:

20/3 ml

Step-by-step explanation:

Original solution volume is 50ml out of which 15% is acid

Vol of acid in solution = 15% x 50 = 7.5 ml

Let's add X ml of acid to solution so that acid % is 25%

New acid volume = X + 7.5

New solution volume = X + 50

Using ratio of acid/solution gives us (X+7.5)/(X+50) = 25/100

or,

(X + 7.5)/(X+50) = 1/4

Cross-multiplying

4(X+7.5) = X + 50

4X + 30 = X + 50

3X = 20

X = 20/3 ANS

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You are working hard at the local grocery store each weekend. You have decided to put your money in a compound interest bearing

PilotLPTM [1.2K]

Answer:

The answer would be 18 years

Step-by-step explanation:

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3 years ago

What is the 4th term of the geometric sequence with <img src="https://tex.z-dn.net/?f=a_%7B1%7D" id="TexFormula1" title="a_{1}"

makvit [3.9K]

<u>Answer:</u>

The 4th term of the geometric sequence with = 5 and ratio (multiplier) = -3 is -135

<u>Solution:</u>

Given that, first term a of a G.P = 5 and common ratio ( r ) = -3 for an geometric progression.

We have to find the 4th term of the above given geometric progression

We know that, nth term of an G.P is given by

$t_{n}=a \cdot r^{n-1}$

So, now, 4th term is

$\begin{aligned} t_{4} &=5 \times(-3)^{4-1} \\ t_{4} &=5 \times(-3)^{3} \\ t_{4} &=5 \times(-27) \end{aligned}$

$t_{4}=-135$

hence, the 4th term of the given G.P is -135

7 0

2 years ago

Can someone help me with this quickly pleaseee

Sati [7]

Answer:

≈ 52m^2

Step-by-step explanation:

1)the face of a semicircle: ( $\pi$ *r^2)/2

2)the face of a rectangle: 6*5

3)the face of a triangle: (3*5)/2

1) d=6m r=3m (3.14*3^2)/2=28.26/2=14.13

2) 6*5=30

3) (3*5)/2=15/2=7,5

Full surface: 14.13+30+7.5=51.63

answer: 51.63m^2 ≈ 52m^2

7 0

2 years ago

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How do you round off 639,121 to the nearest ten thousand?

maxonik [38]

You want to find the closest ten thousand that there is to 639,121.

So a ten thousand is basically anything that ends with four or more zeros.

For example:

530000 would be a ten thousand because it has four zeros at the end.

So you can see what the closest ten thousands are to 639,121 would be.

They would be:

630,000 and 640,000

Since they both have four zeros at the end.

Now you can just tell that 639,121 is closer to 640,000 because the digit in the thousands place, 9, is closer to 10 than 0.

Hope this helped :)

8 0

3 years ago

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Does anyone know this answer??

-Dominant- [34]

Answer:

Obtuse

Step-by-step explanation:

One of the angles is above 90 degrees

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2 years ago

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