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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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Can someone clearly explain and workout Q19? Much appreciated
Anna007 [38]
The x coefficient is 2
Take half of 2 to get 2/2 = 1
Square 1 to get 1^2 = 1

Add and subtract 1 to the expression. This is the same as adding 0. 

x^2 + 2x + 2
x^2 + 2x + 2 + 0
x^2 + 2x + 2 + (1-1)
(x^2 + 2x + 1) + 2 - 1
(x+1)^2 + 1

Answer: (x+1)^2 + 1

 
5 0
3 years ago
Find the area of the shape shown<br> below.
Allisa [31]

Answer:

The area of the figure is 28 units².

Step-by-step explanation:

Find the area of the full rectangle, ignoring the triangle.

a = lw \\ a = 4 \times 8 = 32

Then, find the area of the triangle:

a =  \frac{bh}{2}  \\ a =  \frac{2 \times 4}{2}  \\ a = 4

Finally, subtract:

32 - 4 = 28

7 0
3 years ago
Simplify the expression. Write the answer using scientific notation.
bonufazy [111]

Answer:

  C.  2.5×10^-27

Step-by-step explanation:

(2×10^-13)^-2 = 2^-2 × 10^(13×(-2)) = 1/4 × 10^-26

= 0.25 × 10^-26 = 2.5 × 10^-27

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Your scientific or graphing calculator can compute and display this for you.

4 0
3 years ago
What is the degree of the polynomial?
neonofarm [45]

Answer:

5

Step-by-step explanation:

6x^2 + 7x^3 + 8x^5 +9

Write in order from highest power to lowest power

8x^5 + 7x^3 + 6x^2  +9

The highest power ( largest exponent) is 5

The degree of the polynomial is 5

6 0
2 years ago
If Alex has 4 times as many dimes as nickels and they have a combined value of 270 cents, how many of
bija089 [108]

Answer:

Nickel has 54 cents and Alex has 216 cents.

Step-by-step explanation:

Hope it helps u :)

5 0
3 years ago
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