Biff's suspension bridge has 40-foot towers spaced 80 feet apart. the main cable reaches down to a height of 5 feet from the level road surface; seven vertical cables are spaced 10 feet from each tower and from one another. find the total length of the seven vertical cables, accurate the nearest tenth of a foot.

Can someone me i’m confused. will give brainliest and a whole bunch of points

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?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?