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4 years ago

The sum of two numbers is 45 and its difference is 5

Mathematics

1 answer:

Leno4ka [110]4 years ago

4 0

Answer:

n + n = 45 - 5

Step-by-step explanation:

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4 years ago

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What is the quotient?

ivann1987 [24]

Answer:

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4 years ago

The ratio of the sides of a triangle is 2 6 7 if the perimeter of the triangle is 195 meters

timama [110]

Answer: 91m

Step-by-step explanation:

We set three sides of the triangle equal to 2x,6x,7x; because there is the ratio 2:6:7, which x is a common factor of these three sides.

P = a + b + c

2x + 6x + 7x = 195

15x = 195

x = 13

7x suppose be the longest side of the triangle, we plug in 13 for x, then:

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3 years ago

System w/Elimination<br>-2x-9y=-25<br><br>-4x-9y=-25

Lerok [7]

x=0 and y= $\frac{25}{9}$

Step-by-step explanation:

We need to solve the system by elimination and find values of x and y

$-2x-9y=-25\,\,\,(1)\\-4x-9y=-25\,\,\,(2)$

Subtract eq(1) and eq(2)

$-2x-9y=-25\,\,\,(1)\\-4x-9y=-25\,\,\,(2)\\+\,\,\,+\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,+\\---------\\2x=0\\x=0$

Now Multiply equation (1) by 2 and subtract with eq(2)

$-4x-18y=-50\\-4x-9y=-25\\+\,\,\,\,\,\,+\,\,\,\,\,\,\,\,\,\,\,\,\,\,+\\--------\\-9y=-25\\y=\frac{-25}{-9}\\y=\frac{25}{9}$

So, x=0 and y= $\frac{25}{9}$

Keywords: system by elimination

Learn more about system by elimination at:

#learnwithBrainly

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3 years ago

evaluate the following expression using the values given: find 3x − y − 3z if x = −2, y = 1, and z = −2. a -13 b-1 c 1 d 13

Fantom [35]

3x - y - 3z
The answer is b. -1

6 0

4 years ago