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Valentin [98]
3 years ago
14

Which correctly gives the expression using addition? –17.9 – 4.2

Mathematics
1 answer:
Shkiper50 [21]3 years ago
5 0
<span>c. –17.9+(–4.2)

</span><span><span>The General rule for adding and subtracting numbers </span><span>
1. Two integers with the same signs
Once 2 integers has the same sign, then just add the numbers.
For example</span> 
<span>1. 1+1 = 2 </span>
<span>2. 2 + 5 = 7   </span><span>

2. Two integers with different signs
<span>When 2 integers has different sign, then find the difference
For example
1. 1-1 =0</span></span> 
<span>2. 2 – 5 = -3 </span><span>

3. Two integers that vary in sign
<span>When 2 integers vary in sign, then it will depend who which number carries the largest value
For example</span></span> <span><span>
1.   </span>-3 + 2 = -1</span> 
<span><span>2.   </span>2 – 1 = 1</span><span> </span></span>
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Need help with #12<br> Please help
Korolek [52]

Step-by-step explanation:

If the figure is triangle then,

Let PR be x

So,

PQ+QR+PR= 180 (Sum of all the angles of the triangle)

Therefore,

6x+25+16-3x+x=180

4x+36=180

4x= 180/36

x= 144/4

X= 36

NOW,

PQ= 6x+25

= 6(36)+25

= 216+25 = 241= PQ.

QR = 16-3x

= 16-3(36)

= 16-108

= -92

PR = 36

hope it helps

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