Answer:
1 
Step-by-step explanation:
Note there is a common ratio between consecutive terms, that is
10 ÷ 20 = 5 ÷ 10 = 2
÷ 5 = 
Thus to obtain the next term in the sequence multiply the previous term by 
2
×
= 1 
Answer:
No nail for youuuuuuu
Step-by-step explanation:
yes:x+7=18
no:2x+7=36
x+14=36
not enough info:(2×x)+(2×7)=36
2 (x+7)=72
Answer:
trapezoid
Step-by-step explanation:
If you have a part and a whole you can subtract the part from the whole to find the other part.
I'm not sure about it, but that's my best guess ;3
Good luck!