Please help me this is my last question

An archaelogist in Turkey discovers a
spear head that contains 80% of its
original amount of C-14.
find the age of the spear head to the nearest year

He concluded that a heavier object dropped from the same height as a lighter object will land

There is an entrance to the computer room at point e which lies on ab and is 5 feet from point a. plot point e on the coordinate plane. find the distance from the entrance at point e to the printer at point e

Measure of angles 31 (x+4) (3x+9) me