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pishuonlain [190]
3 years ago
9

Whats the principal?

Mathematics
1 answer:
lilavasa [31]3 years ago
5 0

Step-by-step explanation:

There is a formula:

I = PRT/100

so P= (100× I) ÷ RT

P= ( 28 × 100 ) ÷ 4×7

P= $100

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Use elimination method to solve<br> 5x+y=-10<br> 7x-3y=-36
k0ka [10]
5x+y=-10\\ \\ 7x-3y=-36

Let's multiply the first equation by 3. (As you can see y's coefficient in the first one is 1 and in the second one is -3 , we will multiply the first equation by 3 so when we add the equations their sum will be 0)

3\cdot (5x+y)=3\cdot -10\\ \\ 15x+3y=-30

Now let's add this new equation and our second equation.

7x-3y=-36\\ \\ 15x+3y=-30\\ \\ (15x+3y)+(7x-3y)=(-30)+(-36)\\ \\ 15x+7x+3y-3y=-30-36\\ \\ 22x=-66\\ \\ x=\frac { -66 }{ 22 } \\ \\ x=-3

We found x=-3

Now let's plug x's value in one of the equations to find y's value.

x=-3\\ \\ 5x+y=-10\\ \\ 5\cdot -3+y=-10\\ \\ -15+y=-10\\ \\ y=-10+15\\ \\ y=5

So we found y=5

Solution ;

(-3, 5)

7 0
3 years ago
Evaluate the expression for <br> b = -6.<br> 3b =
ch4aika [34]

Answer:

-18

Step-by-step explanation:

Hope that helps

You do 3(-6) to get neg 18

6 0
3 years ago
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Which number make this sentence true 27:45=45:x​
PSYCHO15rus [73]

Answer:

x = 75

Step-by-step explanation:

We can write this as a proportion

27            45

--------- = --------

45            x

We can use cross products to solve

27 x = 45 *45

Divide each side by 27

27 x/27 = 45*45 /27

x = 75

5 0
3 years ago
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PLEASE HELP LOVELIES?? xxx
Lelechka [254]
The data set has no association.
4 0
4 years ago
Find the slope of a line parallel to each given line y = 1
NeX [460]
Don’t take my word for it but if there’s no x then it might be undefined.
Sorry if I’m incorrect
4 0
3 years ago
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