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hoa [83]
4 years ago
15

8.6+23.4+1.4. Using mental math

Mathematics
1 answer:
horrorfan [7]4 years ago
8 0
8.6+23.4=32
32+1.4=33.4
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Evaluate the following expression (2.3)-3(1,1)
uranmaximum [27]

Answer:

<em><u>2</u></em><em><u>.</u></em><em><u>3</u></em><em><u> </u></em><em><u>-</u></em><em><u> </u></em><em><u>(</u></em><em><u> </u></em><em><u>3</u></em><em><u>,</u></em><em><u> </u></em><em><u>1</u></em><em><u>)</u></em><em><u> </u></em>

Step-by-step explanation:

1) Simplify  3 × (1, 1) 3 × (1, 1)  to  3× 1, 13 × 1,1.

<em>2</em><em>.</em><em>3</em><em> </em><em>-</em><em> </em><em>(</em><em> </em><em>3</em><em> </em><em>×</em><em> </em><em>1</em><em>,</em><em> </em><em>1</em><em> </em><em>)</em>

2) Simplify 3 × 1 to 3.

2.3 - ( 3, 1)

<em><u>Therefor</u></em><em><u>,</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>answer</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>2</u></em><em><u>.</u></em><em><u>3</u></em><em><u> </u></em><em><u>-</u></em><em><u> </u></em><em><u>(</u></em><em><u> </u></em><em><u>3</u></em><em><u>,</u></em><em><u> </u></em><em><u>1</u></em><em><u>)</u></em><em><u>.</u></em>

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3 years ago
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Given the system of equations presented here:
Bumek [7]

ANSWER

The correct answer is option B

EXPLANATION


The equations are

3x+5y=29---(1)


and


x+4y=16---(2)


When we multiply the second equation by -3, we obtain;


-3x-12y=-48---(3)


When we combine this new equation with equation (1).


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We can see that x has been eliminated from the equation.


We can then, solve for  y and then substitute the result in to any of the equations to find x.


Hence the correct answer is option B



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I don't understand this factorisation <br> a2+ 4a+3​
Tomtit [17]

Answer:

\boxed{\sf (a + 3)(a + 1)}

Step-by-step explanation:

\sf Factor  \: the  \: following:  \\  \sf \implies  {a}^{2}  + 4a + 3 \\  \\  \sf The \:  factors  \: of \:  3 \:  that \:  sum \:  to \:  4  \\ \sf are \:  3  \: and  \:  1. \\ \\  \sf So,  \\   \sf \implies {a}^{2}  + (3 + 1)a + 3 \\  \\  \sf \implies   {a}^{2}  + 3a + a + 3 \\  \\  \sf \implies a(a + 3) + 1(a + 3)  \\  \\ \sf \implies (a + 3)(a + 1)

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liberstina [14]

Answer:

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Step-by-step explanation:

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4 years ago
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