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Naddik [55]
3 years ago
5

Simplify 8 + 2(10 – r)

Mathematics
2 answers:
AleksandrR [38]3 years ago
7 0
8 + 2(10 - r)
Distribute: 2(10 - r)

8 + 20 - 2r
Evaluate: 8 + 20

Convert: -2r + 28

-2r + 28
mixer [17]3 years ago
6 0
Distribute
a(b+c)=ab+ac
2(10-r)=20-2r

now we have
8+20-2r
28-2r
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The 10th term of an a.p is -27 and the 5th term is -12 .find the first term?​
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Step-by-step explanation:

a_{10} = - 27... (Given) \\\\\therefore a + 9d = - 27...... (1)\\\\a_{5} = - 12... (Given) \\\\\therefore a + 4d = - 12.......(2)\\\\

Subtracting equation (2) from equation (1)

a + 9d-( a + 4d )= - 27-(-12)\\\\\therefore a +9d - a-4d = - 27+12\\\\\therefore 5d = - 15\\\\\therefore d = \frac {- 15}{5}\\\\\huge \orange {\boxed {\therefore d = -3}} \\\\

Substituting d = - 3 in equation (1), we find:

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