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horsena [70]
4 years ago
5

What is 2 / 9 x - 9 / 2im having a hard time solving this

Mathematics
1 answer:
vfiekz [6]4 years ago
7 0
Answer is 34 .2/9 × 9 /2 = 34
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The half-life of Einsteinium 253 is 20.5 days. If you start with 5g
tatiyna

Answer:

1.753 g

Step-by-step explanation:

Half life of Einsteinium = 20.5 days

Time elapsed = 31 days

Initial quantity of the substance = 5g

The formula to apply is;

N( t )=N_o( \frac{1}{2}  )^{\frac{t}{t0.5} }

Where

N(t)=quantity of a substance remaining

No =Initial quantity of the substance = 5g

t= time elapsed=31 days

t1/2 = half life of the substance= 20.5 days

N(t)=5 * {1/2} ^ {31/20.5}

N{t} = 5 * {0.5}^1.5

N{t} = 5*0.3506

N{t} =1.753 g

7 0
3 years ago
PLEASE ANSWER!!!!!!
Contact [7]

Answer:

The answer is D

Step-by-step explanation:

the first one is equal to the equation 4 < 3 because of absolute value, second 4 < 3, third 3 < -4, fourth -3 < 4

7 0
3 years ago
Read 2 more answers
Find the perimeter and area of each figure.​
Sergio039 [100]

Answer:

  1. A = 2x; P = 4x+2. A = 4; P = 10.

  2. A = y² +2; P = 4y +2. A = 27; P = 22.

Step-by-step explanation:

1. The area is the sum of the marked areas of each of the tiles:

  A = x + x

  A = 2x

__

The perimeter is the sum of the outside edge dimensions of the tiles. Working clockwise from the upper left corner, the sum of exposed edge lengths is ...

  P = 1 + (x-1) + x + 1 + (x+1) + x

  P = 4x +2

__

When x=2, these values become ...

  A = 2·2 = 4 . . . . square units

  P = 4·2+2 = 10 . . . . units

_____

2. Again, the area is the sum of the marked areas:

  A = y² + 1 + 1

  A = y² +2

__

The edge dimension of the square y² tile is presumed to be y, so the perimeter (starting from upper left) is ...

  P = y +(y-2) +1 +2 +(y+1) +y

  P = 4y +2

__

When y=5, these values become ...

  A = 5² +2 = 27 . . . . square units

  P = 4·5 +2 = 22 . . . . units

4 0
4 years ago
**10 POINTS PLEASE HELP!!**
Sliva [168]

Answer:

The volume increases by a factor or 64. When the cube is dilated, each side length is increased by 4, so the volume is increased by 64.

Step-by-step explanation:

Let L represents the Length of the cube before it's dilated.

Volume, V1 = Length * Length * Length

Volume, V1 = L * L * L

Volume, V1 = L³

When the cube is dilated by a factor of 4.

The new Length becomes 4L.

The new volume is calculated as thus.

New Volume, V2 = 4L * 4L * 4L

New Volume, V2 = 64L³

Dividing the new volume by the old volume gives the increment factor.

Factor = New Volume ÷ Old Volume

Factor = V2/V1

Factor = 64L³/L³

Factor = 64.

Hence, when the sides of the cube is dilated by 4, the volume increases by a factor of 64.

Filling the gap of the given sentence;

"The volume increases by a factor or 64. When the cube is dilated, each side length is increased by 4, so the volume is increased by 64"

8 0
3 years ago
What is the product of (7.28 x 10-2). (9.1 x 10-2)?
tangare [24]

Answer:

B

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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