What is the grade average of 75 70 90 60 50 90 70

Answer:

The charges that atoms make when they bond with other atoms can be determined by looking at their positions on the periodic table. Here is a breakdown of the charges for the given elements in Column A:

1. Calcium (Ca): Calcium belongs to Group 2 on the periodic table, which means it has 2 valence electrons. When calcium bonds, it tends to lose these 2 electrons, resulting in a charge of +2 (answer b).

2. Francium (Fr): Francium belongs to Group 1 on the periodic table, which means it has 1 valence electron. When francium bonds, it tends to lose this electron, resulting in a charge of +1 (answer f).

3. Bromine (Br): Bromine belongs to Group 7 on the periodic table, which means it has 7 valence electrons. When bromine bonds, it tends to gain 1 electron, resulting in a charge of -1 (answer f).

4. Sulfur (S): Sulfur belongs to Group 6 on the periodic table, which means it has 6 valence electrons. When sulfur bonds, it can either gain 2 electrons to have a charge of -2 (answer c) or lose 2 electrons to have a charge of +2 (answer b).

5. Xenon (Xe): Xenon belongs to Group 8 on the periodic table, which means it has 8 valence electrons. Xenon is a noble gas and tends to not form bonds with other atoms. Therefore, it does not typically have a charge (answer a).

6. Carbon (C): Carbon belongs to Group 4 on the periodic table, which means it has 4 valence electrons. When carbon bonds, it can either gain 4 electrons to have a charge of -4 (answer h) or lose 4 electrons to have a charge of +4 (answer h).

7. Phosphorous (P): Phosphorous belongs to Group 5 on the periodic table, which means it has 5 valence electrons. When phosphorous bonds, it tends to gain 3 electrons, resulting in a charge of -3 (answer d).

8. Boron (B): Boron belongs to Group 3 on the periodic table, which means it has 3 valence electrons. When boron bonds, it tends to lose 3 electrons, resulting in a charge of +3 (answer e).

To summarize:

Calcium (Ca): +2 (b)

Francium (Fr): +1 (f)

Bromine (Br): -1 (f)

Sulfur (S): -2 (c) or +2 (b)

Xenon (Xe): 0 (a)

Carbon (C): -4 (h) or +4 (h)

Phosphorous (P): -3 (d)

Boron (B): +3 (e)

2+x=8-x

add x to each side to get all the x's on one side

2+x+x = 8-x+x

2 + 2x = 8

now subtract 2 from each side to get all the numbers on the other side

2 + 2x -2 = 8-2

2x = 6

divide by 2 on each side to get x alone

2x/2 = 6/2

x=3

Answer: x=3

Answer:x=3 I hope this helps you

Step-by-step explanation:

2+x=8-x

Move the variable to the left-hand side and change its sign like this

2+x+x=8

then do this

Move the constant to the right-hand side and change its sign like this

x+x=8-2

then do this

Collect like terms

Like this

2x=8-2

Subtract the numbers
2x=6

then do this

Divide both sides of the equation by 2 and you will get your answer

X=3

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Esse e o site em Ingles, pergunta no em portugues, eles vao responder em portugues, boa sorte

Final answer:

João Augusto's ball remained in the air for 8 seconds. This was determined by the roots of the equation -5t² + 40t = 0, which represents the ball's vertical trajectory.

Explanation:

The equation given in the question represents the motion of the ball thrown into the air. Specifically, it is a parabolic equation which describes the motion of an object under the influence of gravity. We can determine the duration of the ball's flight by finding the roots of this equation.

The equation -5t² + 40t = 0 can be factored into -5t(t - 8) = 0. Therefore, the roots of this equation are 0 and 8, which represent the instants of time. In this case, t = 0 is the time when João Augusto launched the ball, and t = 8 is the time when he caught it again.

So, the ball remained in the air for 8 seconds.

Learn more about Quadratic Equations here:

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the range of length: (18.50 to 18.60 in.)

the range of width: (36.70 to 36.80 in.)