All of the following developments were available to humans during the paleolithic era except
a.
the controlled use of fire
b.
tools made of stone and bone
c.
spears
d.
pottery

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.

Ihave no idea what the answer is

5×^2+20-15 or -(5x^2-20+15)