Escreva com suas palavras as definições de: semirreta e segmento de reta

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Suppose a ball is dropped fromca height of 6ft. it bounces back up but time it bounces, it reaches only 7/10 of its pervious height. what is the total of each height that the ball reaches after 5 bounces

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under