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prisoha [69]
3 years ago
10

A chemist has 0.2 liters of an acid solution whose acid concentration is 65%. How many liters of pure water should be added to l

ower the concentration to 50%?
Mathematics
1 answer:
lorasvet [3.4K]3 years ago
4 0

Answer:

0.06

Step-by-step explanation:

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Point O is the center of the circle in the diagram. What is m/_BCA
SVETLANKA909090 [29]

Answer:

< BCA = 70

Step-by-step explanation:

The complete central angle of a circle is 360 degrees. The given portion is 250 degrees.

What is left over? BOA = 360 - 250 = 110

Tangents always meet the radius at 90 degrees. Since there are two tangents <CAO = <BAO = 90 degrees.

So piecing it all together, the equation becomes

<BAO + CAO + BAO + ACB = 360

110 + 90 + 90 + <ACB = 360

290 + <ACB = 360

<ACB + 290 - 290 = 360 - 290

ACB = 70 degrees

3 0
4 years ago
which term best describes a proof in which you assume the opposite of what you want to prove? A. proof by syllogism B. proof by
ozzi
The answer of the above question is letter <em>C. proof by contradiction</em>. It is a type of proving where the evidence does not support the reverse assumption crediting the original statement as true. This proof can also be referred as "reductio ad absurdum" which are Latin word for "reduced to an absurdity" 
6 0
4 years ago
Solve the equation below. *<br> b + (-43) = 87
Rom4ik [11]

Answer:

b=130

Step-by-step explanation:

b+(-43)=87

b+(-43+43)=87+43

b=130

Hope this helps. Have a great day, you amazing bean child.

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5 0
3 years ago
Read 2 more answers
400 meters of fencing . Twice as long as it is wide , what is the area
NNADVOKAT [17]

Answer:

The area is 13,3 squared meters

Step-by-step explanation:

The 400 meters of fencing is the perimeter of the area. We know that:

perimeter = 2 (length + width)

or

P = 2 (l+w)

We also know that the length is twice the width, hence:

l = 2w

Substituting this information in the perimeter equation:

P = 2 (2w + w)

P = 4w+2w

P = 6w

w = P/6

Now, the area is defined as:

A = l*w

Therefore,

A = 2*w*w

A = 2 * w^2

Putting the w =P/6 in the previous equation

A = 2 * (P/6)^2

A = 2 * P^2/36

A = P^2/12

And substituting the value of P and doing the math,

A = 13, 333 period 3 which we need to round to 13,3 which is the total number of significant digits given

6 0
4 years ago
PLZ HELP ME WITH THIS
Basile [38]
It's shifted left 2 units and down 5 units.

To find the point on the graph of g, we use the horizontal shift for the x-coordinate 4 to get 4–2=2, and the vertical shift for the y-coordinate –3 to get –3–5=–8.


4 0
4 years ago
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