Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 18 h. When the second student helps, they can build a computer in 7.2 h. How long would it take the second student, working alone, to build the computer?

Ms. sutton recorded the word counts and scores of the top ten essays in a timed writing contest. the table shows her data. how does the word count of an essay relate to its score in the contest? word count tends to decrease as the score decreases. word count tends to increase as the score decreases. word count tends to remain constant as the score decreases. word count has no apparent relationship to the score of the essay.

I’m really confused and need to learn this

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?