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3 years ago

How many neutrons does element X have if its atomic number is 25 and its mass number is 85?

Mathematics

2 answers:

Lynna [10]3 years ago

5 0

Neutrons= Atomic Mass Number- Atomic Mass Number

So 85-25= 60

Natalija [7]3 years ago

3 0

Answer:

60 neutrons

Step-by-step explanation:

We are given that the atomic number of an element X is 25 and its mass number is 85 and we are find the number of neutrons this element has.

We will use the following formula to find the number of neutrons:

Neutrons = Atomic mass number - Atomic number

So substituting the given values in the above formula to get:

Number of neutron = 85 - 25 = 60

Therefore, element X has 60 neutrons.

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H(x) = x2 + 3x – 2; 12 - h(7)10

nikitadnepr [17]

Answer:

2x + -10 = 10 + -3x

Reorder the terms:

-10 + 2x = 10 + -3x

Move all terms containing x to the left, all other terms to the right.

Add '3x' to each side of the equation.

-10 + 2x + 3x = 10 + -3x + 3x

Combine like terms: 2x + 3x = 5x

-10 + 5x = 10 + -3x + 3x

Combine like terms: -3x + 3x = 0

-10 + 5x = 10 + 0

-10 + 5x = 10

Add '10' to each side of the equation.

-10 + 10 + 5x = 10 + 10

Combine like terms: -10 + 10 = 0

0 + 5x = 10 + 10

5x = 10 + 10

Combine like terms: 10 + 10 = 20

5x = 20

Divide each side by '5'.

x = 4

hope dis helps <3

8 0

2 years ago

PLEASE HELP ME Multiply the monomials: a2x5b, −0.6axb2 and 0.6a2b3

Tanzania [10]

Answer:

$-0.36 a^{5}b^{6} x^{6}$

Step-by-step explanation:

Given:

$a^2x^5b,,\ -0.6axb^2,\ and\ 0.6a^2b^3$

Required

Multiply

The above can be written as

$a^2x^5b * -0.6axb^2\ * \ 0.6a^2b^3$

Split the above expression

$a^2*x^5*b * -0.6*a*x*b^2\ * \ 0.6*a^2*b^3$

Collect like terms

$-0.6 * 0.6 * a^2*a*a^2*b *b^2 *b^3*x^5*x$

Apply first law on indices

$-0.36 * a^{2+1+2} *b^{1+2+3} *x^{5+1}$

$-0.36 * a^{5} *b^{6} *x^{6}$

$-0.36 a^{5}b^{6} x^{6}$

Hence, $a^2x^5b * -0.6axb^2\ * \ 0.6a^2b^3$ is equivalent to $-0.36 a^{5}b^{6} x^{6}$

8 0

3 years ago

17. Higher Order Thinking Solve h - 156 = 34

vaieri [72.5K]

Answer: h = 190.

Step-by-step explanation: You have to use the reverse so, the opposite of subtraction is addition, so 156 + 34 = 190. 190 which is the "h" 190 - 156 = 34

8 0

3 years ago

Okay I got a question

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What’s the question?

7 0

2 years ago

Please help mee! <33 y+4=-4(x+2) in standard form! <3

Pachacha [2.7K]

Answer:

y = -4x - 12

Step-by-step explanation:

y + 4 = -4(x + 2)

y = -4x -8 - 4

y = -4x - 12

6 0

2 years ago

Read 2 more answers