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3 years ago

I don't know this please help give brainlest

Mathematics

2 answers:

IgorC [24]3 years ago

8 0

Answer:

Step-by-step explanation:

Given, 

Sides of the triangle = (5k-7) cm, (k-4) cm and (3m - 9) cm

Therefore, 

Perimeter of the triangle in cm = (5k -7) cm + (k-4) cm + (3m - 9) cm

= 5k - 7 + k - 4 + 3m - 9

= 5k + k -7 - 4 - 9 + 3m

= 6k -20 + 3m

= - 20 + 3m + 6k

Hence,

-20 + 3m + 6k is the perimeter of the triangle in cm.

BigorU [14]3 years ago

5 0

Answer:

-20+3m+6k

Is the required answer.

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Please help this is due today!!!!!

Bad White [126]

Answer:

x=15

y=36

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Step-by-step explanation:

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What is the expression of 3^9

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Well, 3^9 is the same thing as
3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3
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3. For the equation-4y = &r, what is the constant of variation? (1 point) ООО 02

alexandr1967 [171]

Answer:

3).

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If it was by 10, k = 3 by 10

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5).

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3 years ago

The area of a rectangle is 21 cm². If one side exceeds the other by 4 cm, find the dimensions of the rectangle.

Over [174]

Answer:

3cm and 7cm

Step-by-step explanation:

The length is 7cm.

The width is 3cm.

Area = Length × Width = 7cm × 3cm = 21cm²

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3 years ago

Is my solution correct?

nlexa [21]

Hello there!

Yes, your solution is correct! A way to check it is replacing the value you found for x into x in the equation.

3(2-x) = 7 - 4x ⇒ 3(2-1) = 7 - 4(1)

And now solve 3(2-1) = 7 - 4(1).

3(1) = 7 - 4(1)

3 = 7 - 4

3 = 3

Since it is a true statement that 3 is equal to 3, it means your solution of x = 1 is correct. Good job! :)

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