Question
For the following arithmetic progressions write the first term a and the common difference d:
$-1.1, -3.1, -5.1, -7.1, .....$
$-1.1, -3.1, -5.1, -7.1, .....$
✓
Answer
$-1.1, -3.1, -5.1, -7.1, .....$
Here first term $(a) = -1.1$
We have $= a_2- a_1= -3.1 - (-1.1)$
$= -3.1 + 1.1 = -2.0$
$ a_3-a_2=-5.1-(-3.1)=-5.1+3.1=-2.0 $
$a_4-a_3=-7.1-(-5.1)=-7.1+5.1=-2.0$
$\therefore$ Common difference $= -2.0.$
Here first term $(a) = -1.1$
We have $= a_2- a_1= -3.1 - (-1.1)$
$= -3.1 + 1.1 = -2.0$
$ a_3-a_2=-5.1-(-3.1)=-5.1+3.1=-2.0 $
$a_4-a_3=-7.1-(-5.1)=-7.1+5.1=-2.0$
$\therefore$ Common difference $= -2.0.$
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