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:
1,-2
Step-by-step explanation:
You can also say the answer is C.
15x10=150
Subtract 5x5=25 small square cut out
150 -25= 125 sq ft
D
A rational
B Irrational
C Irrational
~ThePirc