Answer:
0.3
Step-by-step explanation:
x is the number to be added to 0.7 to have a sum of 1.



Answer:
on the number line make an open circle at 80 (am open circle is this: ○) and connect that to an arrow that points back to 0 and the negative numbers. It doesn't matter how far back as long as you make it an arrow
Answer:
x not given
therefore no answer for x