15. determine the values of the unknown variables.

i'm really just asking how i can get x. from there i can do it i'm just confused in this step

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

Find the solution(s) to x^2-14+49=0

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.