Sumerians first used the wheel to make

The wheel was invented by the ancient Sumerians. The concept of the wheel actually grew out of a mechanical device that the Sumerians had invented shortly after 3500 BC the potter's wheel. No other civilization of their time had one. This was a heavy flat disk made of hardened clay.

Explanation:

d: social contract theory

3 notebooks and 3 pencils packages

step-by-step explanation:

((3×1.25)+(3×2.75))=12

3×1.25=3.75

3×2.75=8.25

3.75+8.25=$12