Anyone know how to do this? pls help

Ineed someone to me answer my question i have to have this done and knocked out

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams