3 years ago

2-1 help anyone pls............

Mathematics

1 answer:

ValentinkaMS [17]3 years ago

3 0

Answer:

In what book?

Step-by-step explanation:

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Multiply -3x(4x - 5)

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Hopes this helps if right please mark as brainlist:

Answer: -12x^2 + 15x

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Answer:

Step-by-step explanation:

Perimeter= 4S

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3 years ago

8÷2(2+2)<br>what is the anwer<br>

Colt1911 [192]

Answer:

Step-by-step explanation:

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2 years ago

The mass of an electron is approximately 9 × 10-28 grams, while the mass of a neutron is approximately 2 × 10-24 grams. Which of

aalyn [17]

Answer: the mass of a neutron is approximately 2,000 times the mass of an electron

Step-by-step explanation:

- the easiest way to solve this (in my opinion) is to simply divide the mass of a neutron by the mass of an electron

- $2 x10^{-24} / (9 x10^{-28} )$

= $(2/9) x10^{-24--28}$

= $(2/9)x10^{-24+28}$

≈ $0.2222x10^{28-24}$

≈ $0.2222x10^{4}$

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- so 2222 is approximately 2000 times

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hope this helps :)

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