Hydrogen-3 has a half-life of 12.35 years. what mass of hydrogen-3 will remain form a 100.0 mg initial sample after 5.0 years? a) 7 mg b) 24 mg c) 76 mg d) 18 mg

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

If anyone who can me with this hw? i would really appreciate it