PLS HELP 150 POINTS
If you started with a sample that contained 4 grams of strontium-90, how much strontium-90 would be left after 84 years?

3 grams

0.5 gram

2 grams

1 gram

Approximately hiw many new case of sti occur in the united states

Choose the correct drug to complete the sentence. is a powerful stimulant. is a highly addictive opiate. is prescribed for medical purposes in many states.which locations are covered in the drug-free school policy? check all that apply. school bus home school lunchroom sporting event at another school shopping center

Which action encourages homophobia? tolerating others’ opinions welcoming someone into a group respecting others' differences accepting inappropriate terminology