What is necessary condition in logic?
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necessity and sufficiency

Step-by-step explanation:

In logic and mathematics, necessity and sufficiency are terms used to describe a conditional or implicational relationship between two statements.

In general, a necessary condition is one that must be present in order for another condition to occur, while a sufficient condition is one that produces the said condition.

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1

150

step-by-step explanation:

(sorry i'm not typing it again just read the other two explanation sections i just typed it'll be the same.)