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Talja [164]
3 years ago
13

Enter a number in each box so that the expressions are equivalent. (A) 0.8 (2x + x) + 3(7 - 4.1x) = x + 21 (B) 12 1 2 (6x + 22y)

= x + y (C) (3x - ) - (6x + 1) = -3x - 2 (D) 112 1 2 x + 27y = (12 1 2 x + 9y)
Mathematics
2 answers:
mixas84 [53]3 years ago
6 0

Answer:

<u>The answers are:</u>

<u>1.  -9.9x</u>

<u>2.  3x + 11y</u>

<u>3.  1</u>

<u>4.  3</u>

blondinia [14]3 years ago
3 0

The questions aren't well formatted ; from the values that are observable,

Answer:

Coefficient of x = -9.9 ;

Coefficient of x = 75

Coefficient of y = 275

Step-by-step explanation:

Given :

0.8 (2x + x) + 3(7 - 4.1x) = __x + 21

0.8(3x) + 21 - 12.3x = __x + 21

2.4x + 21 - 12.3x = __x + 21

-9.9x + 21 = __x + 21

-9.9

12 1/2 (6x + 22y) = x + y

75x + 275y = x + y

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What is the percent increase in the surface area of the AAA battery to the AA battery? Round your answer to the nearest tenth of
Bogdan [553]

Answer:

101.1%

Step-by-step explanation:

The two batteries are in the shape of cylinder.

The total surface area of a cylinder

SA = (2πr^2 + 2πrh ) =

For AAA battery

h = 0.8mm

r = 1.9 mm

SA = (2π(1.9)^2 + 2π × 1.9 × 0.8 )

SA = 22.68 + 9.55

SA = 32.23 mm^2

For AA battery

h = 1 mm

r = 2.75 mm

SA = (2π(2.75)^2 + 2π×2.75× 1 )

SA = 47.52 + 17.28

SA = 64.80 mm^2

Increase in SA = 64.80 - 32.23

Increase in SA = 32.57

% increase = increase in SA/AAA × 100

% increase in SA = 32.57/32.23 × 100

% increase in SA = 101.1%

4 0
4 years ago
PLZ EXPLAIN HOW TO DO THIS
Hitman42 [59]
Hello! Sorry, this took a minute. 

All of the x's are on the same line, and they are equal to 180 degrees. 

2x+x+3x+x=180 

A straight line equals 180. 

Combine like terms. 

7x=180

Divide both sides by 7. 

25.714... round to 25.7

Now, plug that into the angle that is vertical to 2y. (3x)

3(25.7)= 77.1

So, 3x= 77.1 and 2y= 77.1

Plug that in. 

2y=77.1

Divide both sides by 2. 

y=38.55

Round that up to 38.6. 

"D" is the answer.

I hope this helps!
~kaikers
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Answer:

The answer is -243.97

Step-by-step explanation:

-89.16-154.81= -243.97

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