the half-life of the radioactive element unobtanium-47 is 5 seconds. if 80 grams of unobtanium-47 are initially present, how many grams are present after 5 second? 10 seconds? 15 seconds? 20 seconds? 25 seconds

Will mark brainliest, , and rate to only chrislaurencelle clarissa made a scale drawing of a rectangle. she used a scale factor of 3 to draw the new rectangle. how does the length of the new rectangle compare to the original? the length of the new rectangle is 3 times shorter than the original. the length of the new rectangle is 12 times shorter than the original. the length of the new rectangle is 3 times longer than the original. the length of the new rectangle is 12 times longer than the original.