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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