81485 rounded to the nearest thousand

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Secant be and cf intersect at point d inside a what is the measure of cde