Please help me i make my questions worth more, and give brainliest x^2 - 10x +

a. x^2-10x+20
b. x^2-10x+100
c. x^2-10x+25
d. x^2-10x-25

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Which zero pair could be added to the function f(x) = x2 + 12x + 6 so that the function can be written in vertex form? o 3, -3o 6,629,-936, 36

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?