Can anyone with the next part on this tbt im really struggling with 6 and 8 and show work

What is the missing constant term in the perfect square that starts with x^2 -20x

(30 points). the population of a city is 45,000 and decreases 2% each year. if the trend continues, what will the population be aer 15 yrs

Arental car company charges $45 plus 0.20 per mile to rent a car. mr. lawrence does not want to spend more than $100 for his rental car. write and solve an inequality to find how many miles he can drive and not spend more than $100. inequality: 45+0.20m is less than or equal to 100 solution: m is less than or equal to 275? interpret the solution: ?