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zvonat [6]
3 years ago
9

Please help me with my question!!

Mathematics
2 answers:
zlopas [31]3 years ago
8 0
A and C are false.
B and D are true.
enyata [817]3 years ago
5 0

Let's test each option.

Option A:

7 + (-8) + 1 = -1 + 1 = 0

TRUE

Option B:

-15/2 + 7 = -7.5 + 7 = -0.5

FALSE

Option C:

-5 + 4 + (-1) = -1 + (-1) = -2

TRUE

Option D:

-14 + 28/2 = -14 + 14 = 0

FALSE

The only correct options is A and C.

Best of Luck!

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Answer in scientific notation?
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The answer is:  45 * 10 ⁻¹¹ .
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Explanation:
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Given:   (9 * 10⁻⁵) * (5 *10 ⁻⁶) ;   Simplify.
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 (9 * 10⁻⁵) * (5 *10⁻⁶)  =

9 * 5 * 10⁻⁵ * 10⁻⁶ = 

(9 * 5) * 10⁻⁵ * 10⁻⁶ 

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Note the following property of exponents:

xᵃ * xᵇ = x⁽ᵃ⁺ᵇ⁾ ;

As such, 10⁻⁵ * 10⁻⁶ = 10⁽⁻⁵ ⁺ ⁻⁶) = 10 ⁻¹¹ ;
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So;  45 * 10⁻⁵ * 10⁻⁶ 

           =  45 * 10⁻¹¹ .
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