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Finger [1]
3 years ago
12

A laboratory technician needs to make a ​81-liter batch of a ​20% acid solution. How can the laboratory technician combine a bat

ch of an acid solution that is pure acid with another that is ​10% to get the desired​ concentration?
Mathematics
1 answer:
Ludmilka [50]3 years ago
5 0
Honedtlrfjdjdjdjfjfjjfjfjfjjf
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Use two rectangles of equal width to estimate the area between the graph of f(x) = x + cos(πx) and the x-axis on the interval [2
MrRissso [65]
We find the base of the rectangles by taking the difference between the interval endpoints, and dividing by 2.
Base of rectangle = (6 - 2) / 2
= 2

The area of the first rectangle:

(4 - 2)f(4) = 2[4 + cos(4π)]


The area the second triangle:

(6 - 4)f(6) = 2[6 + cos(6π)]


Now just compute the two areas and combined them. That will give you the estimated under the curve.


To evaluate the midpoint of each rectangle, we take the midpoint of the base lengths of each rectangle. This midpoint is the x value. Then evaluate the function at that x value.


The midpoint of the first rectangle is x=3. Evaluate f(3).
The midpoint of the second rectangle is x=5. Evaluate f(5).
7 0
3 years ago
Please help and explain why, so that I understand.
chubhunter [2.5K]
Hello there!

The number of people in different cities should be represented on a graph as Two-dimensional. 

I'll explain why: The number of dimensions you need on a graph is equal to the number of variables that you are studying. In this case, you have two variables in the study:

1)The number of people
2)The city where they live

You'll need a two-dimensional graph with two axes in which one of the axes represents the number of people and the other axis represents the city. If you were also studying the age of those people, you'll need one more dimension to include this new variable. 

Have a nice day!
8 0
3 years ago
Please help me with these questions. I’m genuinely confused.
jok3333 [9.3K]

Answer:

16. 1 4/5

17. 2 2/3

18. 4/11

19. 4 1/2

20. 4/7

21. 1/2

22. 1 2/5

23. 2 1/2

24. 4 2/3

Step-by-step explanation:

1. subtract whole numbers first

2. subtract fractions next (simplify if you can)

3. subtract fractions and whole numbers

8 0
2 years ago
What is the center and radius of the circle (x+4)^2+(y+6)^2=64
meriva

Answer:

Step-by-step explanation:

hello :

the center is : (-4 , -6)  and radius 8

5 0
3 years ago
Can you do my ixls for me its 7th grade math and the ixl I want you to do is v3
klemol [59]
Send problems not a questions
4 0
3 years ago
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