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olga55 [171]
3 years ago
7

The sum of the two numbers is 12. The difference is 18. Write a system of equations to represnt the statement and what are the t

wo numbers​
Mathematics
1 answer:
Kazeer [188]3 years ago
4 0
X = 15 and Y = -3 because X + Y = 12
X - Y = 18
__________
2X = 30
X = 15
15 + Y = 12
Y = -3
You can substitute the X value into either equation from the first two equations
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Please help me solve this
grigory [225]

Answer:

The length of river D is 2550

length of river C is 2550+500=3050

Step-by-step explanation:

Let the river D be 'x'

and the river C is (x+500)

x + x + 500 = 5600

2x + 500 = 5600

2x = 5600 - 500

2x = 5100

x = 5100/2

x = 2550

The length of river D is 2550

length of river C is 2550+500=3050

7 0
3 years ago
Gabriel and his friends went into a restaurant and they want to buy some chicken wings and tacos. Each chicken wing costs $0.50
Musya8 [376]
The chicken wings costs 15 $ whiles the tacos cost8$
7 0
3 years ago
Can Somebody Solve This Equation ?
fiasKO [112]

C= 10+30x

X=9 here so

C= 20+30(9)

So

C=290

4 0
3 years ago
Read 2 more answers
Right triangle XYZ has right angle Z. If the sin(X)=1213<br> , what is the cos(X)
AlekseyPX

Given:

Right triangle XYZ has right angle Z.

\sin(x)=\dfrac{12}{13}

To find:

The value of \cos x.

Solution:

We know that,

\sin^2(x)+\cos^2(x)=1

\cos^2(x)=1-\sin^2(x)

\cos(x)=\pm\sqrt{1-\sin^2x}

For a triangle, all trigonometric ratios are positive. So,

\cos(x)=\sqrt{1-\sin^2x}

It is given that \sin(x)=\dfrac{12}{13}. After substituting this value in the above equation, we get

\cos(x)=\sqrt{1-(\dfrac{12}{13})^2}

\cos(x)=\sqrt{1-\dfrac{144}{169}}

\cos(x)=\sqrt{\dfrac{169-144}{169}}

\cos(x)=\sqrt{\dfrac{25}{169}}

On further simplification, we get

\cos(x)=\dfrac{\sqrt{25}}{\sqrt{169}}

\cos(x)=\dfrac{5}{13}

Therefore, the required value is \cos(x)=\dfrac{5}{13}.

6 0
3 years ago
What are ratios that are equivalent to 6:21
mr_godi [17]

Answer:

2:7

Step-by-step explanation:

<u>Step 1:  Divide both sides by 3 </u>

6:21

(6/3):(21/3)

2:7

Answer:  2:7

7 0
3 years ago
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