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3 years ago

9. Select all expressions that are

Mathematics

2 answers:

Kruka [31]3 years ago

7 0

Answer:

Step-by-step explanation:

2(9a - 6) = 2*9a - 2*6 = 18a - 12

Yes, it is equivalent.

6*(3a-2) = 6*3a - 6*2 = 18a - 12

Yes, it is equivalent.

-3(6a+4)= -3*6a + 4*(-3) = -18a - 12

No, not equivalent

3(6a+4) = 3*6a + 3*4 = 18a + 12

No, not equivalent

-3(4-6a) = -3*4 - 6a*(-3 ) = -12 + 18a = 18a - 12

Yes, it is equivalent.

Bogdan [553]3 years ago

3 0

Answer:

Step-by-step explanation:

2(9a - 6) = 2 × 9a + 2 × (-6)

= 18a - 12

6(3a - 2) = 6 × 3a + 6 × (-2)

= 18a - 12

- 3( 4 - 6a ) = - 3 × 4 + (-3) × (- 6a)

= - 12 + 18a = 18a - 12

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3 years ago

The measures of the angles of △ABC are given by the expressions in the table. Angle Measure A (4x−13)° B 15° C (x+18)∘ What

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Answer:

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Step-by-step explanation:

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2 years ago

2.1x10^6<br> ______<br> 7x10^3<br><br> answer in standard form<br> ...................10^......

VMariaS [17]

Given:

The expression is:

$\dfrac{2.1\times 10^6}{7\times 10^3}$

To find:

The simplified form of the given expression in standard form.

Solution:

We have,

$\dfrac{2.1\times 10^6}{7\times 10^3}$

It can be written as:

$\dfrac{2.1\times 10^6}{7\times 10^3}=\dfrac{21\times 10^5}{7\times 10^3}$

$\dfrac{2.1\times 10^6}{7\times 10^3}=\dfrac{21}{7}\times \dfrac{10^5}{10^3}$

$\dfrac{2.1\times 10^6}{7\times 10^3}=3\times 10^{5-3}$ $[\because \dfrac{a^m}{a^n}=a^{m-n}]$

$\dfrac{2.1\times 10^6}{7\times 10^3}=3\times 10^2$

Therefore, the required value is $3\times 10^2$ .

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3 years ago