3 years ago

How many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution?

Mathematics

1 answer:

tatiyna3 years ago

4 0

3 liters must be added

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The mean score on a set of 16 tests is 90. What’s the sum of all the test scores?

Anettt [7]

It should be 90 because in question it says that

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3 years ago

Eugene walked all the way to school at 3 mph then realized she forgot her math book (how could she?!), so she ran back at 7 mph.

Fynjy0 [20]

$\text{Answer: }1\frac{23}{40}\ miles\text{ far she live from school.}$

Explanation:

Since we have given that

Speed at which Eugene walked all the way to school = 3 mph

After realizing that she forgot her math book, she ran back

Speed at which Eugene walked back to her house = 7 mph

Let the distance between her house and her school be x

According to question,

$\frac{x}{3}+\frac{x}{7}=\frac{45}{60}\\\\\frac{7x+3x}{21}=\frac{3}{4}\\\\\frac{10x}{21}=\frac{3}{4}\\\\x=\frac{3\times 63}{4\times 10}=\frac{63}{40}=1\frac{23}{40}\ miles.$

Hence,

$1\frac{23}{40}\ miles\text{ far she live from school.}$

8 0

3 years ago

THIS IS THE THIRD AND FINAL TIME I WILL EVER POST A QUESTION ON BRAINLY IF SOMEONE GIVES ME A INCOMPLETE QUESTION (AKA TROLL COM

Afina-wow [57]

B and C are correct because you do basic PEMDAS and get 58 for both those expressions. If this is right could you possibly give me brainliest? Hope this helped.

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3 years ago

B - (- 7) =-1<br> what is b?

irina1246 [14]

B-(-7)= -1

First negative multiply by negative is POSITIVE.

So: B+7= -1

Subtract 7 from both sides

B= -7-1

B= -8.

Answer: -8.

To Check Answer: Plug in the variable of B in the original equation.

So: -8-(-7)= -1

-8+7= -1

-1= -1

If the Solution works out the answer is right.

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3 years ago

Read 2 more answers

Which shows the expression below simplified?

patriot [66]

Answer:

Step-by-step explanation:

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2 years ago