Jack wanted to make note cards by cutting pieces of paper in half. Before starting he got ten more pieces to use. When he was done he had 20 half-pieces of paper. With how many pieces did he start?

10

Step-by-step explanation:

if you take 10 note cards and cut in half you will have 20 pieces

He Started With 7 Pieces

Step-by-step explanation:

as x + 3

2(+3) 20.

2(+3)=20

+3=10

=7

7 .

1/800 is the right answer

a. is correct