Did i did it right and explain the answer?

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Write an equation of the line given the two points below (write your equation in slope-intercept form, y=mx+b): (-4, 4) and (6, -4)

Marina baked cookies. she gave 3/4 of the cookies to the scout bake sale. she shared the remaining 6 cookies with her friends. how many cookies did marina bake?