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ra1l [238]
3 years ago
14

Giving brainliest to whoever answers this.

Mathematics
1 answer:
hjlf3 years ago
8 0

Answer:

5,1

Step-by-step explanation:

7x + 4y = 39

2x + 4y = 14

since, the 4y same for both equation then we can eliminate the 4y by subtracting the two equation

7x + 4y = 39

2x + 4y = 14

---------------- -

5x + 0 = 25

5x = 25

x = 25/5 = 5

then we can input (subtitute) the value of x into the equation, I choose 2x + 4y = 14

2x + 4y = 14

2(5) + 4y = 14

10 + 4y = 14

4y = 14 - 10

4y = 4

y = 4/4 = 1

or if your teacher ask you to use elimination to find the value of x we can write like this

7x + 4y = 39

2x + 4y = 14

make the coeficient of x in both equation same

7x + 4y = 39 (x2)

2x + 4y = 14 (x7)

so

14x + 8y = 78

14x + 28y = 98

--------------------- -

0 - 20y = -20

-20y = -20

y = (-20)/(-20) = 1 (same answer right)

so the correct answe is

(5,1)

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Tom [10]
The answer is 57 becasue 125-68=57
7 0
4 years ago
6. Multiselect A square room has side lengths
Scilla [17]

The area of a square and a rectangle is given by multiplying the lengths of the sides of the square

A. The correct statements are;

The area of one square tiles <u>9·x²</u>

The area of the floor is <u>36·x⁶</u>

B. The number of tiles needed to cover the floor <u>324 tiles</u>

<u />

The reason the above values are correct are as follows:

A. The given parameters are;

The expression that represents the side lengths of the square room = 6·x³ feet

The side lengths of the square tiles = 3·x

Required:

To select the correct expressions

Solution:

The area of one square tiles = 3·x × 3·x = 9·x²

The area of the floor = 6·x³ × 6·x³ = 36·x⁽³ ⁺ ³⁾ = 36·x⁶

B. If x = 3, we have;

The \ number \ of \ tiles = \dfrac{Area \ of \ floor}{Area \ of \ a \ tile}

The area of the floor, = 36×3⁶ = 26,244

The area of one tile = 9 × 3² =  81

The \ number \ of \ tiles = \dfrac{26,244}{81}  = 324

The number of tiles needed to cover the floor = <u>324 tiles</u>

Learn more about multiplying side lengths to find area here:

brainly.com/question/13048427

brainly.com/question/3143510

brainly.com/question/11979926

3 0
3 years ago
I need help with them two
Naily [24]
A) multiply both sides by 21 so x=7
B) multiply both sides by x, then both sides by 84, then divide both sides by 150 so x=14
8 0
3 years ago
Read 2 more answers
Categorize the following variables as being qualitative or quantitative: (relevant section):
FrozenT [24]

Answer:

1. Quantitative

2. Quantitative

3. Qualitative

4. Qualitative

5. Quantitative

Step-by-step explanation:

A variable is quantitative if it assumes numerical values, for example 1,2,3.

If it assumes "labels", for example good or bad, it is qualitative.

1. Rating of the quality of a movie on a 7-point scale

It assumes numerical values, for example, 1,2,3,...

So it is quantitative

2. Age

It assumes numerical values, for example, 1,20,35,...

So it is quantitative

3. Country you were born in

Descriptive, such as Brazil, USA, Colombia, ...

So it is qualitative.

4. Favorite Color

Descriptive, such as black, brown, red, blue

So it is qualitative

5. Time to respond to a question

It assumes numerical values, for example, 1,20,35,...

So it is quantitative

5 0
3 years ago
What is the volume of a cylinder with base radius 2 and height 5?
lina2011 [118]

Answer:

V ≈ 62.83

Step-by-step explanation:

<u>Cylinder Formulas in terms of r and h</u>

Calculate the volume of a cylinder:

V = πr2h

Calculate the lateral surface area of a cylinder (just the curved outside):

L = 2πrh

Calculate the top and bottom surface area of a cylinder (2 circles):

T = B = πr2

Total surface area of a closed cylinder is:

A = L + T + B = 2πrh + 2(πr2) = 2πr(h+r)

Solution

V=πr 2h = π · 22 · 5 ≈ 62.83185

Therefore, the volume of the cylinder in the nearest tenths is V ≈ 62.83

3 0
3 years ago
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