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Dmitry_Shevchenko [17]
3 years ago
13

What is the percent increase when 7,200 increases by 1,800?

Mathematics
2 answers:
sergeinik [125]3 years ago
5 0

Answer:

25 percent

Step-by-step explanation:

7200 divided by 1800 is 25

Bingel [31]3 years ago
5 0

Answer:

25%

Step-by-step explanation:

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Need help finding the x, y, and z. please and thank you
Reptile [31]

The first step in any problem is to look at what you are given. When solving systems of linear equations, it is often helpful to eliminate one or more of the variables by adding or subtracting a multiple of one equation with a multiple of another. It is convenient when at least one of the multipliers is 1.

Here, we can cancel the y-terms in the 2nd and 3rd equations simply by adding them together. This gives

... (5x +y -4z) +(-3x -y +5z) = (41) +(-45)

... 2x +z = -4 . . . . simplified

Likewise, we can add 3 times the second equation to the first to cancel y in that sum.

... 3(5x +y -4z) +(2x -3y +z) = 3(41) + (-1)

...15x +3y -12z +2x -3y +z = 123 -1

...17x -11z = 122 . . . . simplified

Now that we have 2 equations in x and z, we can go through the same process. We observe that the coefficient of z is +1 in the first equation and -11 in the second. The means we can cancel the z terms by adding 11 times the first equation to the second:

... 11(2x +z) +(17x -11z) = 11(-4) +122

...22x +17x = 78 . . . . . . simplify a little bit

... x = 78/39 = 2 . . . . . . divide by 39

From above, we find

... z = -4 -2x = -4 -2·2 = -8

... y = 41 -5x +4z = 41-5(2) +4(-8) = 41 -42 = -1

The solution is (x, y, z) = (2, -1, -8).

_____

The method of elimination used here will vary with the system of equations. If you want to employ a consistent method, you can use Cramer's Rule, Gaussian elimination, or matrix methods. Since you apparently don't mind help from technology, learning to do this on your graphing calculator can also be a good idea.

4 0
3 years ago
HELP FAST
evablogger [386]

Answer:

  D)  5/12

Step-by-step explanation:

Suppose there are 30 girls at the school. Then the proportions tell you that 12 of them study music, and 5 of them study both music and dance.

Then 5 of the 12 girls who study music also study dance. That fraction is 5/12.

_____

We chose 30 because it is the least common multiple of the denominators of the fractions (2/5, 3/5, 1/6) in the problem statement.

Of course, you know that 2/5·30 = 12, and 1/6·30 = 5.

7 0
3 years ago
Please answer this :l I don’t know how to do it
Goshia [24]

Answer:

show range that is between 3 and 10

Step-by-step explanation:

6 0
3 years ago
Best explained and correct answer gets brainliest!!
sp2606 [1]
The correct answer is c
7 0
3 years ago
Read 2 more answers
I need help on all these, plss !!​
dolphi86 [110]

Answer:

8a) 100,90,110,70, 130

8b) 110, 100,120,80,140

8c)110

8d) Once you added 10 to each number the mean had a value of +10

8e) Make 8 points higher on each test.

Step-by-step explanation:

Hope this helps and have a great day!!

3 0
3 years ago
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