The average atomic mass of fictitious element z is 261. 4 amu. Z has only 2 isotopes. One of its isotopes has an atomic mass of 260. 0 amu the other 264. 0 amu. Choose the abundance for the isotopes.

To safely control the traffic flow and protect workers near public roadways and moving construction equipment use you could use

Determine if the situation below is a safe practice: julia needs to hang some industrial shelving, so she carefully selects the correct drill bits for the electrical drill before attempting to screw the shelves into the wall.

Acheetah ran 75 meters at a speed of 25 meters per second. how long was the cheetah running? 3 seconds 5 seconds 30 seconds 50 seconds