Question

The Incas developed a record-keeping system using

shells and beads on strings.
knots and designs in strings.
writing and pictographs.
numbers and calculations

Answer 1

Answer: b-knots and designs in strings.

Explanation: just did the test much love byee

Answer 2

The Incas developed a record-keeping system using knots and designs in strings.

Step-by-step explanation:

BTW .... They're called quipu. Now you know. :-)