To estimate the height of a tree, a geometry student measures the shadow of the tree that is 30 feet from the base tree. they place a steak at the top of the shadow. the student is 4 feet from the stake, and the students height is 5.5 ft how tall is the tree

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Can someone pls ! pls answer all. no explanation needed..

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.