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2 years ago

If an atom has 5 protons, 7 neutrons and 5 electrons what is the mass number of the atom?

Mathematics

1 answer:

Mariana [72]2 years ago

5 0

Answer:

7+5=12

Step-by-step explanation:

To calculate the mass number of an atom, you have to add the protons and the neutrons. We have 7 neutrons and 5 protons, so your mass number would be 12. Let me know if you have any further questions. :)

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Which is a solution to the system of inequalities? y≤-1/2x+3 y≥x+1

Serggg [28]

Answer:

y≤-1/2(x=4)+3

Step-by-step explanation:

4 0

2 years ago

If (ax+2)(bx+7)=15x2+cx+14 for all values of x, and a+b=8, what are the 2 possible values fo c

dolphi86 [110]

Given:

$(ax+2)(bx+7)=15x^2+cx+14$

And

$a+b=8$

Required:

To find the two possible values of c.

Explanation:

Consider

$\begin{gathered} (ax+2)(bx+7)=15x^2+cx+14 \\ abx^2+7ax+2bx+14=15x^2+cx+14 \end{gathered}$

$\begin{gathered} ab=15-----(1) \\ 7a+2b=c \end{gathered}$

And also given

$a+b=8---(2)$

Now from (1) and (2), we get

$\begin{gathered} a+\frac{15}{a}=8 \\ \\ a^2+15=8a \\ \\ a^2-8a+15=0 \end{gathered}$ $a=3,5$

Now put a in (1) we get

$\begin{gathered} (3)b=15 \\ b=\frac{15}{3} \\ b=5 \\ OR \\ b=\frac{15}{5} \\ b=3 \end{gathered}$

We can interpret that either of a or b are equal to 3 or 5.

When a=3 and b=5, we have

$\begin{gathered} c=7(3)+2(5) \\ =21+10 \\ =31 \end{gathered}$

When a=5 and b=3, we have

$\begin{gathered} c=7(5)+2(3) \\ =35+6 \\ =41 \end{gathered}$

Final Answer:

The option D is correct.

31 and 41

8 0

1 year ago

(5y 3 + 20y 2 – 12)(2y3 - 15y2 + 4y + 16)

Alex

Answer:

225y5-192

Step-by-step explanation:

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2 years ago

Find the percentage of 1 nickel and 4 pennies

Lyrx [107]

It is equal to 9 cents

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3 years ago

In ∆AED, m∠DAE = 54°. What is m∠DAG?? m∠DAG = °

notka56 [123]

Answer: this is not worth 5 points

Step-by-step explanation:

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2 years ago

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