The question is:
f(x)=
show that (f·)(a)=a=(·f)(a) for any a in the respective domains.

can somebody explain the question to me? i'm not even sure what it means. what are respective domains? ?

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?