an element with mass 650 grams decays by 12.50% per day. how much of the element is remaining after 8 days to the nearest 10th of a gram

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What expression is equivalent to log3(x+4)