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Misha Larkins [42]
3 years ago
10

Help me with #4 pleasedeeee

Mathematics
1 answer:
Romashka [77]3 years ago
4 0

Answer:

\dfrac{dy}{dx}=-\dfrac{2x-y-1}{2y-x-1}

Step-by-step explanation:

Differentiating, you get ...

... x·dy +y·dx +dx +dy = 2x·dx +2y·dy

Collecting terms gives ...

... dy(x +1 -2y) = dx(2x -y -1)

... dy/dx = -(2x -y -1)/(2y -x -1)

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A) 120 is what percentage of 30
scZoUnD [109]

Answer:

a ) 400 percent

b )  n = 25

c)  n= 36

Step-by-step explanation:

Is means equals, of means multiply and percents need to be changed to decimals.

a) 120 is what percentage of 30

120 = P * 30

Divide each side by 30

120/30 =P* 30/30

4 = P

Multiply by 100 to give the percentage

4 * 100

400 percent


b) 30 is 120% of what number

30 = 1.2 * n

Divide each side by 1.2

30/1.2 = 1.2n/1.2

25  = n


c) what number is 30%of 120

n = .3 * 120

n =36


3 0
3 years ago
Read 2 more answers
A copy machine makes 126 copies in 4 minutes and 30 seconds. How many copies does it make per minute?
Aliun [14]

Answer:

it makes about 41 copies per minute

6 0
3 years ago
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Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. The results in the screen disp
e-lub [12.9K]

Answer:

D. is the correct answer, hope this helps!


4 0
3 years ago
Read 2 more answers
Give me an example of a unit rate used in a real world sutuation
mixer [17]
A unit rate simply means how many of one type of units you get per 1 other type of unit. 
Examples of that:
300\frac{l}{ s }

This is rate of fluid flow of some pump for example. It pumps 300 liters every second.

Other example:
50 \frac{km}{h}
This is example for speed. Somebody is moving at 50 kilometers per hour (every hour he travels 50 kilometers)
5 0
3 years ago
Emily added 5 grams of water into 20 grams of 50% salt solution. She made ___ grams of ___% salt solution.
yaroslaw [1]
For the first blank, the answer should be the total weight of the solution which is derived from adding 5 grams and 20 grams. The answer would be,

        T = 5 + 20 = 25 grams

For the second blank, the % solution is derived by dividing the amount of salt initially by the total amount of the resulting solution. This is as shown below.

      C = ((20 x 0.5) / 25) x (100%)
 
Simplifying,
      C = 40%

Answers: 
    a. 25 grams
    b. 40%
8 0
3 years ago
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